--- a/.mozilla/firefox/profile/user.js Mon Jan 17 02:23:07 2022 +0300
+++ b/.mozilla/firefox/profile/user.js Mon Jan 17 02:25:53 2022 +0300
-* authors: v52+ github | v51- www.ghacks.net
-* url: https://github.com/ghacksuserjs/ghacks-user.js
-* license: MIT: https://github.com/ghacksuserjs/ghacks-user.js/blob/master/LICENSE.txt
-* releases: These are end-of-stable-life-cycle legacy archives.
- *Always* use the master branch user.js for a current up-to-date version
- url: https://github.com/ghacksuserjs/ghacks-user.js/releases
+* name: arkenfox user.js
+* url: https://github.com/arkenfox/user.js
+* license: MIT: https://github.com/arkenfox/user.js/blob/master/LICENSE.txt
- 0. Consider using Tor Browser if it meets your needs or fits your threat model better
- * https://www.torproject.org/about/torusers.html.en
- 1. READ the full README
- * https://github.com/ghacksuserjs/ghacks-user.js/blob/master/README.md
- * https://github.com/ghacksuserjs/ghacks-user.js/wiki/1.3-Implementation
- 3. If you skipped steps 1 and 2 above (shame on you), then here is the absolute minimum
- * Real time binary checks with Google services are disabled (0412)
- * You will still get prompts to update Firefox, but auto-installing them is disabled (0302a)
- * Some user data is erased on close (section 2800). Change this to suit your needs
- - 4600s: reset prefs made redundant due to privacy.resistFingerprinting (RPF)
- or enable them as an alternative to RFP (or some of them for ESR users)
- - 9999s: reset deprecated prefs in about:config or enable the relevant section for ESR
- * Site breakage WILL happen
- - There are often trade-offs and conflicts between Security vs Privacy vs Anti-Fingerprinting
- and these need to be balanced against Functionality & Convenience & Breakage
- * You will need to make changes, and to troubleshoot at times (choose wisely, there is always a trade-off).
- While not 100% definitive, search for "[SETUP". If required, add each pref to your overrides section at
- default values (or comment them out and reset them in about:config). Here are the main ones:
+ 1. Consider using Tor Browser if it meets your needs or fits your threat model
+ * https://www.torproject.org/about/torusers.html.en
+ 2. Required reading: Overview, Backing Up, Implementing, and Maintenance entries
+ * https://github.com/arkenfox/user.js/wiki
+ 3. If you skipped step 2, return to step 2
+ * There are often trade-offs and conflicts between security vs privacy vs anti-fingerprinting
+ and these need to be balanced against functionality & convenience & breakage
+ * Some site breakage and unintended consequences will happen. Everyone's experience will differ
+ e.g. some user data is erased on close (section 2800), change this to suit your needs
+ * While not 100% definitive, search for "[SETUP" tags
+ e.g. third party images/videos not loading on some sites? check 1601
+ * Take the wiki link in step 2 and read the Troubleshooting entry
[SETUP-SECURITY] it's one item, read it
[SETUP-WEB] can cause some websites to break
- [SETUP-CHROME] changes how Firefox itself behaves (i.e. NOT directly website related)
- [SETUP-PERF] may impact performance
- [SETUP-HARDEN] maybe you should consider using the Tor Browser
- * [WARNING] tags are extra special and used sparingly, so heed them
- 4. BACKUP your profile folder before implementing (and/or test in a new/cloned profile)
- 5. KEEP UP TO DATE: https://github.com/ghacksuserjs/ghacks-user.js/wiki#small_orange_diamond-maintenance
+ [SETUP-CHROME] changes how Firefox itself behaves (i.e. not directly website related)
+ 6. Override Recipes: https://github.com/arkenfox/user.js/issues/1080
+* RELEASES: https://github.com/arkenfox/user.js/releases
+ * It is best to use the arkenfox release that is optimized for and matches your Firefox version
+ * EVERYONE: each release
+ - run prefsCleaner to reset prefs made inactive, including deprecated (9999s)
+ - If you are not using arkenfox v78... (not a definitive list)
+ - 1244: HTTPS-Only mode is enabled
+ - 4511: non-native widget theme is enforced
+ - 9999: switch the appropriate deprecated section(s) back on
0200: GEOLOCATION / LANGUAGE / LOCALE
- 0400: BLOCKLISTS / SAFE BROWSING
- 0500: SYSTEM ADD-ONS / EXPERIMENTS
0600: BLOCK IMPLICIT OUTBOUND
- 0700: HTTP* / TCP/IP / DNS / PROXY / SOCKS etc
+ 0700: DNS / DoH / PROXY / SOCKS / IPv6
0800: LOCATION BAR / SEARCH BAR / SUGGESTIONS / HISTORY / FORMS
- 1000: CACHE / SESSION (RE)STORE / FAVICONS
- 1200: HTTPS (SSL/TLS / OCSP / CERTS / HPKP / CIPHERS)
+ 1200: HTTPS (SSL/TLS / OCSP / CERTS / HPKP)
- 2000: MEDIA / CAMERA / MIC
- 2200: WINDOW MEDDLING & LEAKS / POPUPS
+ 2000: PLUGINS / MEDIA / WEBRTC
- 2400: DOM (DOCUMENT OBJECT MODEL) & JAVASCRIPT
- 2500: HARDWARE FINGERPRINTING
+ 2400: DOM (DOCUMENT OBJECT MODEL)
4000: FPI (FIRST PARTY ISOLATION)
4500: RFP (RESIST FINGERPRINTING)
- 4700: RFP ALTERNATIVES (NAVIGATOR / USER AGENT (UA) SPOOFING)
+ 5500: OPTIONAL HARDENING
+ 8000: DON'T BOTHER: NON-RFP
9999: DEPRECATED / REMOVED / LEGACY / RENAMED
/* START: internal custom pref to test for syntax errors
- * [NOTE] In FF60+, not all syntax errors cause parsing to abort i.e. reaching the last debug
- * pref no longer necessarily means that all prefs have been applied. Check the console right
+ * [NOTE] Not all syntax errors cause parsing to abort i.e. reaching the last debug pref
+ * no longer necessarily means that all prefs have been applied. Check the console right
* after startup for any warnings/error messages related to non-applied prefs
* [1] https://blog.mozilla.org/nnethercote/2018/03/09/a-new-preferences-parser-for-firefox/ ***/
user_pref("_user.js.parrot", "START: Oh yes, the Norwegian Blue... what's wrong with it?");
-/* 0000: disable about:config warning
- * FF71-72: chrome://global/content/config.xul
- * FF73+: chrome://global/content/config.xhtml ***/
-user_pref("general.warnOnAboutConfig", false); // XUL/XHTML version
-user_pref("browser.aboutConfig.showWarning", false); // HTML version [FF71+]
+/* 0000: disable about:config warning ***/
+user_pref("browser.aboutConfig.showWarning", false);
/*** [SECTION 0100]: STARTUP ***/
user_pref("_user.js.parrot", "0100 syntax error: the parrot's dead!");
/* 0101: disable default browser check
* [SETTING] General>Startup>Always check if Firefox is your default browser ***/
user_pref("browser.shell.checkDefaultBrowser", false);
-/* 0102: set START page (0=blank, 1=home, 2=last visited page, 3=resume previous session)
- * [NOTE] Session Restore is not used in PB mode (0110) and is cleared with history (2803, 2804)
+/* 0102: set startup page [SETUP-CHROME]
+ * 0=blank, 1=home, 2=last visited page, 3=resume previous session
+ * [NOTE] Session Restore is cleared with history (2803, 2804), and not used in Private Browsing mode
* [SETTING] General>Startup>Restore previous session ***/
//;user_pref("browser.startup.page", 0);
-user_pref("browser.startup.page", 3);
/* 0103: set HOME+NEWWINDOW page
* about:home=Activity Stream (default, see 0105), custom URL, about:blank
* [SETTING] Home>New Windows and Tabs>Homepage and new windows ***/
* [SETTING] Home>New Windows and Tabs>New tabs ***/
user_pref("browser.newtabpage.enabled", false);
user_pref("browser.newtab.preload", false);
-/* 0105: disable Activity Stream stuff (AS)
- * AS is the default homepage/newtab in FF57+, based on metadata and browsing behavior.
- * **NOT LISTING ALL OF THESE: USE THE PREFERENCES UI**
+/* 0105: disable some Activity Stream items
+ * Activity Stream is the default homepage/newtab based on metadata and browsing behavior
* [SETTING] Home>Firefox Home Content>... to show/hide what you want ***/
-/* 0105a: disable Activity Stream telemetry ***/
user_pref("browser.newtabpage.activity-stream.feeds.telemetry", false);
user_pref("browser.newtabpage.activity-stream.telemetry", false);
-/* 0105b: disable Activity Stream Snippets
- * Runs code received from a server (aka Remote Code Execution) and sends information back to a metrics server
- * [1] https://abouthome-snippets-service.readthedocs.io/ ***/
-user_pref("browser.newtabpage.activity-stream.feeds.snippets", false);
-user_pref("browser.newtabpage.activity-stream.asrouter.providers.snippets", "");
-/* 0105c: disable Activity Stream Top Stories, Pocket-based and/or sponsored content ***/
+user_pref("browser.newtabpage.activity-stream.feeds.snippets", false); // [DEFAULT: false FF89+]
user_pref("browser.newtabpage.activity-stream.feeds.section.topstories", false);
user_pref("browser.newtabpage.activity-stream.section.highlights.includePocket", false);
user_pref("browser.newtabpage.activity-stream.showSponsored", false);
user_pref("browser.newtabpage.activity-stream.feeds.discoverystreamfeed", false); // [FF66+]
-/* 0105d: disable Activity Stream recent Highlights in the Library [FF57+] ***/
- // user_pref("browser.library.activity-stream.enabled", false);
-/* 0105e: clear default topsites
+user_pref("browser.newtabpage.activity-stream.showSponsoredTopSites", false); // [FF83+]
+/* 0106: clear default topsites
* [NOTE] This does not block you from adding your own ***/
user_pref("browser.newtabpage.activity-stream.default.sites", "");
-/* 0110: start Firefox in PB (Private Browsing) mode
- * [NOTE] In this mode *all* windows are "private windows" and the PB mode icon is not displayed
- * [WARNING] The P in PB mode is misleading: it means no "persistent" disk storage such as history,
- * caches, searches, cookies, localStorage, IndexedDB etc (which you can achieve in normal mode).
- * In fact, PB mode limits or removes the ability to control some of these, and you need to quit
- * Firefox to clear them. PB is best used as a one off window (File>New Private Window) to provide
- * a temporary self-contained new session. Close all Private Windows to clear the PB mode session.
- * [SETTING] Privacy & Security>History>Custom Settings>Always use private browsing mode
- * [1] https://wiki.mozilla.org/Private_Browsing
- * [2] https://spreadprivacy.com/is-private-browsing-really-private/ ***/
- // user_pref("browser.privatebrowsing.autostart", true);
/*** [SECTION 0200]: GEOLOCATION / LANGUAGE / LOCALE ***/
user_pref("_user.js.parrot", "0200 syntax error: the parrot's definitely deceased!");
-/* 0201: disable Location-Aware Browsing
- * [NOTE] Best left at default "true", fingerprintable, is already behind a prompt (see 0202)
- * [1] https://www.mozilla.org/firefox/geolocation/ ***/
- // user_pref("geo.enabled", false);
-/* 0202: set a default permission for Location (see 0201) [FF58+]
- * 0=always ask (default), 1=allow, 2=block
- * [NOTE] Best left at default "always ask", fingerprintable via Permissions API
- * [SETTING] to add site exceptions: Page Info>Permissions>Access Your Location
- * [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Location>Settings ***/
- // user_pref("permissions.default.geo", 2);
-/* 0203: use Mozilla geolocation service instead of Google when geolocation is enabled [FF74+]
+/* 0201: use Mozilla geolocation service instead of Google if permission is granted [FF74+]
* Optionally enable logging to the console (defaults to false) ***/
user_pref("geo.provider.network.url", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
// user_pref("geo.provider.network.logging.enabled", true); // [HIDDEN PREF]
-/* 0204: disable using the OS's geolocation service ***/
+/* 0202: disable using the OS's geolocation service ***/
user_pref("geo.provider.ms-windows-location", false); // [WINDOWS]
user_pref("geo.provider.use_corelocation", false); // [MAC]
user_pref("geo.provider.use_gpsd", false); // [LINUX]
-/* 0206: disable geographically specific results/search engines e.g. "browser.search.*.US"
- * i.e. ignore all of Mozilla's various search engines in multiple locales ***/
-user_pref("browser.search.geoSpecificDefaults", false);
-user_pref("browser.search.geoSpecificDefaults.url", "");
-/** LANGUAGE / LOCALE ***/
-/* 0210: set preferred language for displaying web pages
+/* 0203: disable region updates
+ * [1] https://firefox-source-docs.mozilla.org/toolkit/modules/toolkit_modules/Region.html ***/
+user_pref("browser.region.network.url", ""); // [FF78+]
+user_pref("browser.region.update.enabled", false); // [FF79+]
+/* 0204: set search region
+ * [NOTE] May not be hidden if Firefox has changed your settings due to your region (0203) ***/
+ // user_pref("browser.search.region", "US"); // [HIDDEN PREF]
+/* 0210: set preferred language for displaying pages
+ * [SETTING] General>Language and Appearance>Language>Choose your preferred language...
* [TEST] https://addons.mozilla.org/about ***/
//;user_pref("intl.accept_languages", "en-US, en");
-/* 0211: enforce US English locale regardless of the system locale
- * [SETUP-WEB] May break some input methods e.g xim/ibus for CJK languages, see [2]
- * [1] https://bugzilla.mozilla.org/867501
- * [2] https://bugzilla.mozilla.org/1629630 ***/
+/* 0211: use US English locale regardless of the system locale
+ * [SETUP-WEB] May break some input methods e.g xim/ibus for CJK languages [1]
+ * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=867501,1629630 ***/
user_pref("javascript.use_us_english_locale", true); // [HIDDEN PREF]
-/* 0212: enforce fallback text encoding to match en-US
- * When the content or server doesn't declare a charset the browser will
- * fallback to the "Current locale" based on your application language
- * [SETTING] General>Language and Appearance>Fonts and Colors>Advanced>Text Encoding for Legacy Content (FF72-)
- * [TEST] https://hsivonen.com/test/moz/check-charset.htm
- * [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/20025 ***/
-//;user_pref("intl.charset.fallback.override", "windows-1252");
-/*** [SECTION 0300]: QUIET FOX
- Starting in user.js v67, we only disable the auto-INSTALL of Firefox. You still get prompts
- to update, in one click. We have NEVER disabled auto-CHECKING, and highly discourage that.
- Previously we also disabled auto-INSTALLING of extensions (302b).
- There are many legitimate reasons to turn off auto-INSTALLS, including hijacked or monetized
- extensions, time constraints, legacy issues, dev/testing, and fear of breakage/bugs. It is
- still important to do updates for security reasons, please do so manually if you make changes.
+/*** [SECTION 0300]: QUIETER FOX ***/
user_pref("_user.js.parrot", "0300 syntax error: the parrot's not pinin' for the fjords!");
-/* 0301b: disable auto-CHECKING for extension and theme updates ***/
- // user_pref("extensions.update.enabled", false);
-/* 0302a: disable auto-INSTALLING Firefox updates [NON-WINDOWS FF65+]
- * [NOTE] In FF65+ on Windows this SETTING (below) is now stored in a file and the pref was removed
+/* 0301: disable auto-INSTALLING Firefox updates [NON-WINDOWS]
+ * [NOTE] You will still get prompts to update, and should do so in a timely manner
* [SETTING] General>Firefox Updates>Check for updates but let you choose to install them ***/
user_pref("app.update.auto", false);
-/* 0302b: disable auto-INSTALLING extension and theme updates (after the check in 0301b)
+/* 0302: disable auto-INSTALLING Firefox updates via a background service [FF90+] [WINDOWS]
+ * [SETTING] General>Firefox Updates>Automatically install updates>When Firefox is not running
+ * [1] https://support.mozilla.org/kb/enable-background-updates-firefox-windows ***/
+user_pref("app.update.background.scheduling.enabled", false);
+/* 0303: disable auto-CHECKING for extension and theme updates ***/
+ // user_pref("extensions.update.enabled", false);
+/* 0304: disable auto-INSTALLING extension and theme updates (after the check in 0303)
* [SETTING] about:addons>Extensions>[cog-wheel-icon]>Update Add-ons Automatically (toggle) ***/
// user_pref("extensions.update.autoUpdateDefault", false);
-/* 0306: disable extension metadata
+/* 0305: disable extension metadata
* used when installing/updating an extension, and in daily background update checks:
* when false, extension detail tabs will have no description ***/
// user_pref("extensions.getAddons.cache.enabled", false);
-/* 0308: disable search engine updates (e.g. OpenSearch)
- * [NOTE] This does not affect Mozilla's built-in or Web Extension search engines
- * [SETTING] General>Firefox Updates>Automatically update search engines (FF72-) ***/
+/* 0306: disable search engine updates (e.g. OpenSearch)
+ * [NOTE] This does not affect Mozilla's built-in or Web Extension search engines ***/
user_pref("browser.search.update", false);
-/* 0309: disable sending Flash crash reports ***/
-user_pref("dom.ipc.plugins.flash.subprocess.crashreporter.enabled", false);
-/* 0310: disable sending the URL of the website where a plugin crashed ***/
-user_pref("dom.ipc.plugins.reportCrashURL", false);
-/* 0320: disable about:addons' Recommendations pane (uses Google Analytics) ***/
+/** RECOMMENDATIONS ***/
+/* 0320: disable recommendation pane in about:addons (uses Google Analytics) ***/
user_pref("extensions.getAddons.showPane", false); // [HIDDEN PREF]
/* 0321: disable recommendations in about:addons' Extensions and Themes panes [FF68+] ***/
user_pref("extensions.htmlaboutaddons.recommendations.enabled", false);
-/* 0330: disable telemetry
- * the pref (.unified) affects the behaviour of the pref (.enabled)
- * IF unified=false then .enabled controls the telemetry module
- * IF unified=true then .enabled ONLY controls whether to record extended data
- * so make sure to have both set as false
- * [NOTE] FF58+ 'toolkit.telemetry.enabled' is now LOCKED to reflect prerelease
- * or release builds (true and false respectively), see [2]
+/* 0322: disable personalized Extension Recommendations in about:addons and AMO [FF65+]
+ * [NOTE] This pref has no effect when Health Reports (0331) are disabled
+ * [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to make personalized extension recommendations
+ * [1] https://support.mozilla.org/kb/personalized-extension-recommendations ***/
+user_pref("browser.discovery.enabled", false);
+/* 0330: disable new data submission [FF41+]
+ * If disabled, no policy is shown or upload takes place, ever
+ * [1] https://bugzilla.mozilla.org/1195552 ***/
+user_pref("datareporting.policy.dataSubmissionEnabled", false);
+/* 0331: disable Health Reports
+ * [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send technical... data ***/
+user_pref("datareporting.healthreport.uploadEnabled", false);
+/* 0332: disable telemetry
+ * The "unified" pref affects the behaviour of the "enabled" pref
+ * - If "unified" is false then "enabled" controls the telemetry module
+ * - If "unified" is true then "enabled" only controls whether to record extended data
+ * [NOTE] "toolkit.telemetry.enabled" is now LOCKED to reflect prerelease (true) or release builds (false) [2]
* [1] https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/internals/preferences.html
* [2] https://medium.com/georg-fritzsche/data-preference-changes-in-firefox-58-2d5df9c428b5 ***/
user_pref("toolkit.telemetry.unified", false);
-user_pref("toolkit.telemetry.enabled", false); // see [NOTE] above FF58+
+user_pref("toolkit.telemetry.enabled", false); // see [NOTE]
user_pref("toolkit.telemetry.server", "data:,");
user_pref("toolkit.telemetry.archive.enabled", false);
user_pref("toolkit.telemetry.newProfilePing.enabled", false); // [FF55+]
user_pref("toolkit.telemetry.updatePing.enabled", false); // [FF56+]
user_pref("toolkit.telemetry.bhrPing.enabled", false); // [FF57+] Background Hang Reporter
user_pref("toolkit.telemetry.firstShutdownPing.enabled", false); // [FF57+]
-/* 0331: disable Telemetry Coverage
+/* 0333: disable Telemetry Coverage
* [1] https://blog.mozilla.org/data/2018/08/20/effectively-measuring-search-in-firefox/ ***/
user_pref("toolkit.telemetry.coverage.opt-out", true); // [HIDDEN PREF]
user_pref("toolkit.coverage.opt-out", true); // [FF64+] [HIDDEN PREF]
user_pref("toolkit.coverage.endpoint.base", "");
-/* 0340: disable Health Reports
- * [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send technical... data ***/
-user_pref("datareporting.healthreport.uploadEnabled", false);
-/* 0341: disable new data submission, master kill switch [FF41+]
- * If disabled, no policy is shown or upload takes place, ever
- * [1] https://bugzilla.mozilla.org/1195552 ***/
-user_pref("datareporting.policy.dataSubmissionEnabled", false);
-/* 0342: disable Studies (see 0503)
+/* 0334: disable PingCentre telemetry (used in several System Add-ons) [FF57+]
+ * Defense-in-depth: currently covered by 0331 ***/
+user_pref("browser.ping-centre.telemetry", false);
+/* 0340: disable Studies
* [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to install and run studies ***/
user_pref("app.shield.optoutstudies.enabled", false);
-/* 0343: disable personalized Extension Recommendations in about:addons and AMO [FF65+]
- * [NOTE] This pref has no effect when Health Reports (0340) are disabled
- * [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to make personalized extension recommendations
- * [1] https://support.mozilla.org/kb/personalized-extension-recommendations ***/
-user_pref("browser.discovery.enabled", false);
+/* 0341: disable Normandy/Shield [FF60+]
+ * Shield is a telemetry system that can push and test "recipes"
+ * [1] https://mozilla.github.io/normandy/ ***/
+user_pref("app.normandy.enabled", false);
+user_pref("app.normandy.api_url", "");
/* 0350: disable Crash Reports ***/
user_pref("breakpad.reportURL", "");
user_pref("browser.tabs.crashReporting.sendReport", false); // [FF44+]
-user_pref("browser.crashReports.unsubmittedCheck.enabled", false); // [FF51+]
-/* 0351: disable backlogged Crash Reports
+ // user_pref("browser.crashReports.unsubmittedCheck.enabled", false); // [FF51+] [DEFAULT: false]
+/* 0351: enforce no submission of backlogged Crash Reports [FF58+]
* [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send backlogged crash reports ***/
-user_pref("browser.crashReports.unsubmittedCheck.autoSubmit2", false); // [FF58+]
-/* 0390: disable Captive Portal detection
- * [1] https://www.eff.org/deeplinks/2017/08/how-captive-portals-interfere-wireless-security-and-privacy
- * [2] https://wiki.mozilla.org/Necko/CaptivePortal ***/
+user_pref("browser.crashReports.unsubmittedCheck.autoSubmit2", false); // [DEFAULT: false]
+/* 0360: disable Captive Portal detection
+ * [1] https://www.eff.org/deeplinks/2017/08/how-captive-portals-interfere-wireless-security-and-privacy ***/
user_pref("captivedetect.canonicalURL", "");
user_pref("network.captive-portal-service.enabled", false); // [FF52+]
-/* 0391: disable Network Connectivity checks [FF65+]
+/* 0361: disable Network Connectivity checks [FF65+]
* [1] https://bugzilla.mozilla.org/1460537 ***/
user_pref("network.connectivity-service.enabled", false);
-/*** [SECTION 0400]: BLOCKLISTS / SAFE BROWSING (SB) ***/
-user_pref("_user.js.parrot", "0400 syntax error: the parrot's passed on!");
-/* 0401: enforce Firefox blocklist
- * [NOTE] It includes updates for "revoked certificates"
- * [1] https://blog.mozilla.org/security/2015/03/03/revoking-intermediate-certificates-introducing-onecrl/ ***/
-user_pref("extensions.blocklist.enabled", true); // [DEFAULT: true]
+/* 0362: enforce disabling of Web Compatibility Reporter [FF56+]
+ * Web Compatibility Reporter adds a "Report Site Issue" button to send data to Mozilla ***/
+user_pref("extensions.webcompat-reporter.enabled", false); // [DEFAULT: false]
- Safe Browsing has taken many steps to preserve privacy. *IF* required, a full url is never
- sent to Google, only a PART-hash of the prefix, and this is hidden with noise of other real
- PART-hashes. Google also swear it is anonymized and only used to flag malicious sites.
- Firefox also takes measures such as striping out identifying parameters and since SBv4 (FF57+)
- doesn't even use cookies. (#Turn on browser.safebrowsing.debug to monitor this activity)
+/*** [SECTION 0400]: SAFE BROWSING (SB)
+ SB has taken many steps to preserve privacy. If required, a full url is never sent
+ to Google, only a part-hash of the prefix, hidden with noise of other real part-hashes.
+ Firefox takes measures such as stripping out identifying parameters and since SBv4 (FF57+)
+ doesn't even use cookies. (#Turn on browser.safebrowsing.debug to monitor this activity)
+ FWIW, Google also swear it is anonymized and only used to flag malicious sites.
- #Required reading [#] https://feeding.cloud.geek.nz/posts/how-safe-browsing-works-in-firefox/
- [1] https://wiki.mozilla.org/Security/Safe_Browsing
- [2] https://support.mozilla.org/en-US/kb/how-does-phishing-and-malware-protection-work
+ [1] https://feeding.cloud.geek.nz/posts/how-safe-browsing-works-in-firefox/
+ [2] https://wiki.mozilla.org/Security/Safe_Browsing
+ [3] https://support.mozilla.org/kb/how-does-phishing-and-malware-protection-work
-/* 0410: disable SB (Safe Browsing)
- * [WARNING] Do this at your own risk! These are the master switches.
- * [SETTING] Privacy & Security>Security>... "Block dangerous and deceptive content" ***/
+user_pref("_user.js.parrot", "0400 syntax error: the parrot's passed on!");
+/* 0401: disable SB (Safe Browsing)
+ * [WARNING] Do this at your own risk! These are the master switches
+ * [SETTING] Privacy & Security>Security>... Block dangerous and deceptive content ***/
// user_pref("browser.safebrowsing.malware.enabled", false);
// user_pref("browser.safebrowsing.phishing.enabled", false);
-/* 0411: disable SB checks for downloads (both local lookups + remote)
- * This is the master switch for the safebrowsing.downloads* prefs (0412, 0413)
+/* 0402: disable SB checks for downloads (both local lookups + remote)
+ * This is the master switch for the safebrowsing.downloads* prefs (0403, 0404)
* [SETTING] Privacy & Security>Security>... "Block dangerous downloads" ***/
// user_pref("browser.safebrowsing.downloads.enabled", false);
-/* 0412: disable SB checks for downloads (remote)
+/* 0403: disable SB checks for downloads (remote)
* To verify the safety of certain executable files, Firefox may submit some information about the
* file, including the name, origin, size and a cryptographic hash of the contents, to the Google
* Safe Browsing service which helps Firefox determine whether or not the file should be blocked
* [SETUP-SECURITY] If you do not understand this, or you want this protection, then override it ***/
user_pref("browser.safebrowsing.downloads.remote.enabled", false);
user_pref("browser.safebrowsing.downloads.remote.url", "");
-/* 0413: disable SB checks for unwanted software
+/* 0404: disable SB checks for unwanted software
* [SETTING] Privacy & Security>Security>... "Warn you about unwanted and uncommon software" ***/
// user_pref("browser.safebrowsing.downloads.remote.block_potentially_unwanted", false);
// user_pref("browser.safebrowsing.downloads.remote.block_uncommon", false);
-/* 0419: disable 'ignore this warning' on SB warnings
+/* 0405: disable "ignore this warning" on SB warnings [FF45+]
* If clicked, it bypasses the block for that session. This is a means for admins to enforce SB
* [TEST] see github wiki APPENDIX A: Test Sites: Section 5
* [1] https://bugzilla.mozilla.org/1226490 ***/
// user_pref("browser.safebrowsing.allowOverride", false);
-/*** [SECTION 0500]: SYSTEM ADD-ONS / EXPERIMENTS
- System Add-ons are a method for shipping extensions, considered to be
- built-in features to Firefox, that are hidden from the about:addons UI.
- To view your System Add-ons go to about:support, they are listed under "Firefox Features"
- Some System Add-ons have no on-off prefs. Instead you can manually remove them. Note that app
- updates will restore them. They may also be updated and possibly restored automatically (see 0505)
- * Portable: "...\App\Firefox64\browser\features\" (or "App\Firefox\etc" for 32bit)
- * Windows: "...\Program Files\Mozilla\browser\features" (or "Program Files (X86)\etc" for 32bit)
- * Mac: "...\Applications\Firefox\Contents\Resources\browser\features\"
- [NOTE] On Mac you can right-click on the application and select "Show Package Contents"
- * Linux: "/usr/lib/firefox/browser/features" (or similar)
- [1] https://firefox-source-docs.mozilla.org/toolkit/mozapps/extensions/addon-manager/SystemAddons.html
- [2] https://dxr.mozilla.org/mozilla-central/source/browser/extensions
-user_pref("_user.js.parrot", "0500 syntax error: the parrot's cashed in 'is chips!");
-/* 0503: disable Normandy/Shield [FF60+]
- * Shield is an telemetry system (including Heartbeat) that can also push and test "recipes"
- * [1] https://wiki.mozilla.org/Firefox/Shield
- * [2] https://github.com/mozilla/normandy ***/
-user_pref("app.normandy.enabled", false);
-user_pref("app.normandy.api_url", "");
-/* 0505: disable System Add-on updates ***/
-user_pref("extensions.systemAddon.update.enabled", false); // [FF62+]
-user_pref("extensions.systemAddon.update.url", ""); // [FF44+]
-/* 0506: disable PingCentre telemetry (used in several System Add-ons) [FF57+]
- * Currently blocked by 'datareporting.healthreport.uploadEnabled' (see 0340) ***/
-user_pref("browser.ping-centre.telemetry", false);
-/* 0515: disable Screenshots
- * alternatively in FF60+, disable uploading to the Screenshots server
- * [1] https://github.com/mozilla-services/screenshots
- * [2] https://www.ghacks.net/2017/05/28/firefox-screenshots-integrated-in-firefox-nightly/ ***/
- // user_pref("extensions.screenshots.disabled", true); // [FF55+]
- // user_pref("extensions.screenshots.upload-disabled", true); // [FF60+]
-/* 0517: disable Form Autofill
- * [NOTE] Stored data is NOT secure (uses a JSON file)
- * [NOTE] Heuristics controls Form Autofill on forms without @autocomplete attributes
- * [SETTING] Privacy & Security>Forms and Autofill>Autofill addresses (FF74+)
- * [1] https://wiki.mozilla.org/Firefox/Features/Form_Autofill
- * [2] https://www.ghacks.net/2017/05/24/firefoxs-new-form-autofill-is-awesome/ ***/
-user_pref("extensions.formautofill.addresses.enabled", false); // [FF55+]
-user_pref("extensions.formautofill.available", "off"); // [FF56+]
-user_pref("extensions.formautofill.creditCards.enabled", false); // [FF56+]
-user_pref("extensions.formautofill.heuristics.enabled", false); // [FF55+]
-/* 0518: disable Web Compatibility Reporter [FF56+]
- * Web Compatibility Reporter adds a "Report Site Issue" button to send data to Mozilla ***/
-user_pref("extensions.webcompat-reporter.enabled", false);
/*** [SECTION 0600]: BLOCK IMPLICIT OUTBOUND [not explicitly asked for - e.g. clicked on] ***/
user_pref("_user.js.parrot", "0600 syntax error: the parrot's no more!");
/* 0601: disable link prefetching
* [1] https://developer.mozilla.org/docs/Web/HTTP/Link_prefetching_FAQ ***/
user_pref("network.prefetch-next", false);
/* 0602: disable DNS prefetching
- * [1] https://www.ghacks.net/2013/04/27/firefox-prefetching-what-you-need-to-know/
- * [2] https://developer.mozilla.org/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control ***/
+ * [1] https://developer.mozilla.org/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control ***/
user_pref("network.dns.disablePrefetch", true);
-user_pref("network.dns.disablePrefetchFromHTTPS", true); // [HIDDEN PREF ESR] [DEFAULT: true FF70+]
+ // user_pref("network.dns.disablePrefetchFromHTTPS", true); // [DEFAULT: true]
/* 0603: disable predictor / prefetching ***/
user_pref("network.predictor.enabled", false);
-user_pref("network.predictor.enable-prefetch", false); // [FF48+]
-/* 0605: disable link-mouseover opening connection to linked server
- * [1] https://news.slashdot.org/story/15/08/14/2321202/how-to-quash-firefoxs-silent-requests
- * [2] https://www.ghacks.net/2015/08/16/block-firefox-from-connecting-to-sites-when-you-hover-over-links/ ***/
+ // user_pref("network.predictor.enable-prefetch", false); // [FF48+] [DEFAULT: false]
+/* 0604: disable link-mouseover opening connection to linked server
+ * [1] https://news.slashdot.org/story/15/08/14/2321202/how-to-quash-firefoxs-silent-requests ***/
user_pref("network.http.speculative-parallel-limit", 0);
-/* 0606: disable "Hyperlink Auditing" (click tracking) and enforce same host in case
+/* 0605: enforce no "Hyperlink Auditing" (click tracking)
* [1] https://www.bleepingcomputer.com/news/software/major-browsers-to-prevent-disabling-of-click-tracking-privacy-risk/ ***/
-user_pref("browser.send_pings", false); // [DEFAULT: false]
-user_pref("browser.send_pings.require_same_host", true);
+ // user_pref("browser.send_pings", false); // [DEFAULT: false]
-/*** [SECTION 0700]: HTTP* / TCP/IP / DNS / PROXY / SOCKS etc ***/
+/*** [SECTION 0700]: DNS / DoH / PROXY / SOCKS / IPv6 ***/
user_pref("_user.js.parrot", "0700 syntax error: the parrot's given up the ghost!");
- * IPv6 can be abused, especially regarding MAC addresses. They also do not play nice
- * with VPNs. That's even assuming your ISP and/or router and/or website can handle it.
- * [STATS] Firefox telemetry (June 2020) shows only 5% of all connections are IPv6
- * [NOTE] This is just an application level fallback. Disabling IPv6 is best done at an
+ * IPv6 can be abused, especially with MAC addresses, and can leak with VPNs: assuming
+ * your ISP and/or router and/or website is IPv6 capable. Most sites will fall back to IPv4
+ * [STATS] Firefox telemetry (July 2021) shows ~10% of all connections are IPv6
+ * [NOTE] This is an application level fallback. Disabling IPv6 is best done at an
* OS/network level, and/or configured properly in VPN setups. If you are not masking your IP,
* then this won't make much difference. If you are masking your IP, then it can only help.
+ * [NOTE] PHP defaults to IPv6 with "localhost". Use "php -S 127.0.0.1:PORT"
* [TEST] https://ipleak.org/
- * [1] https://github.com/ghacksuserjs/ghacks-user.js/issues/437#issuecomment-403740626
- * [2] https://www.internetsociety.org/tag/ipv6-security/ (see Myths 2,4,5,6) ***/
+ * [1] https://www.internetsociety.org/tag/ipv6-security/ (Myths 2,4,5,6) ***/
user_pref("network.dns.disableIPv6", true);
- * HTTP2 raises concerns with "multiplexing" and "server push", does nothing to
- * enhance privacy, and opens up a number of server-side fingerprinting opportunities.
- * [WARNING] Disabling this made sense in the past, and doesn't break anything, but HTTP2 is
- * at 40% (December 2019) and growing [5]. Don't be that one person using HTTP1.1 on HTTP2 sites
- * [1] https://http2.github.io/faq/
- * [2] https://blog.scottlogic.com/2014/11/07/http-2-a-quick-look.html
- * [3] https://http2.github.io/http2-spec/#rfc.section.10.8
- * [4] https://queue.acm.org/detail.cfm?id=2716278
- * [5] https://w3techs.com/technologies/details/ce-http2/all/all ***/
- // user_pref("network.http.spdy.enabled", false);
- // user_pref("network.http.spdy.enabled.deps", false);
- // user_pref("network.http.spdy.enabled.http2", false);
- // user_pref("network.http.spdy.websockets", false); // [FF65+]
-/* 0703: disable HTTP Alternative Services [FF37+]
- * [SETUP-PERF] Relax this if you have FPI enabled (see 4000) *AND* you understand the
- * consequences. FPI isolates these, but it was designed with the Tor protocol in mind,
- * and the Tor Browser has extra protection, including enhanced sanitizing per Identity.
- * [1] https://tools.ietf.org/html/rfc7838#section-9
- * [2] https://www.mnot.net/blog/2016/03/09/alt-svc ***/
-user_pref("network.http.altsvc.enabled", false);
-user_pref("network.http.altsvc.oe", false);
-/* 0704: enforce the proxy server to do any DNS lookups when using SOCKS
+/* 0702: set the proxy server to do any DNS lookups when using SOCKS
* e.g. in Tor, this stops your local DNS server from knowing your Tor destination
* as a remote Tor node will handle the DNS request
* [1] https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO/WebBrowsers ***/
user_pref("network.proxy.socks_remote_dns", true);
-/* 0708: disable FTP [FF60+]
- * [1] https://www.ghacks.net/2018/02/20/firefox-60-with-new-preference-to-disable-ftp/ ***/
- // user_pref("network.ftp.enabled", false);
-/* 0709: disable using UNC (Uniform Naming Convention) paths [FF61+]
+/* 0703: disable using UNC (Uniform Naming Convention) paths [FF61+]
* [SETUP-CHROME] Can break extensions for profiles on network shares
* [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/26424 ***/
user_pref("network.file.disable_unc_paths", true); // [HIDDEN PREF]
-/* 0710: disable GIO as a potential proxy bypass vector
+/* 0704: disable GIO as a potential proxy bypass vector [FF60+]
* Gvfs/GIO has a set of supported protocols like obex, network, archive, computer, dav, cdda,
* gphoto2, trash, etc. By default only smb and sftp protocols are accepted so far (as of FF64)
* [1] https://bugzilla.mozilla.org/1433507
- * [2] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/23044
- * [3] https://en.wikipedia.org/wiki/GVfs
- * [4] https://en.wikipedia.org/wiki/GIO_(software) ***/
+ * [2] https://en.wikipedia.org/wiki/GVfs
+ * [3] https://en.wikipedia.org/wiki/GIO_(software) ***/
user_pref("network.gio.supported-protocols", ""); // [HIDDEN PREF]
+/* 0705: disable DNS-over-HTTPS (DoH) rollout [FF60+]
+ * 0=off by default, 2=TRR (Trusted Recursive Resolver) first, 3=TRR only, 5=explicitly off
+ * see "doh-rollout.home-region": USA Feb 2020, Canada July 2021 [3]
+ * [1] https://hacks.mozilla.org/2018/05/a-cartoon-intro-to-dns-over-https/
+ * [2] https://wiki.mozilla.org/Security/DOH-resolver-policy
+ * [3] https://blog.mozilla.org/mozilla/news/firefox-by-default-dns-over-https-rollout-in-canada/
+ * [4] https://www.eff.org/deeplinks/2020/12/dns-doh-and-odoh-oh-my-year-review-2020 ***/
+ // user_pref("network.trr.mode", 5);
+/* 0706: disable proxy direct failover for system requests [FF91+]
+ * [WARNING] Default true is a security feature against malicious extensions [1]
+ * [SETUP-CHROME] If you use a proxy and you trust your extensions
+ * [1] https://blog.mozilla.org/security/2021/10/25/securing-the-proxy-api-for-firefox-add-ons/ ***/
+ // user_pref("network.proxy.failover_direct", false);
-/*** [SECTION 0800]: LOCATION BAR / SEARCH BAR / SUGGESTIONS / HISTORY / FORMS
- Change items 0850 and above to suit for privacy vs convenience and functionality. Consider
- your environment (no unwanted eyeballs), your device (restricted access), your device's
- unattended state (locked, encrypted, forensic hardened). Likewise, you may want to check
- the items cleared on shutdown in section 2800.
- [NOTE] The urlbar is also commonly referred to as the location bar and address bar
- #Required reading [#] https://xkcd.com/538/
+/*** [SECTION 0800]: LOCATION BAR / SEARCH BAR / SUGGESTIONS / HISTORY / FORMS ***/
user_pref("_user.js.parrot", "0800 syntax error: the parrot's ceased to be!");
/* 0801: disable location bar using search
- * Don't leak URL typos to a search engine, give an error message instead.
+ * Don't leak URL typos to a search engine, give an error message instead
* Examples: "secretplace,com", "secretplace/com", "secretplace com", "secret place.com"
- * [NOTE] This does **not** affect explicit user action such as using search buttons in the
- * dropdown, or using keyword search shortcuts you configure in options (e.g. 'd' for DuckDuckGo)
+ * [NOTE] This does not affect explicit user action such as using search buttons in the
+ * dropdown, or using keyword search shortcuts you configure in options (e.g. "d" for DuckDuckGo)
* [SETUP-CHROME] If you don't, or rarely, type URLs, or you use a default search
* engine that respects privacy, then you probably don't need this ***/
user_pref("keyword.enabled", false);
user_pref("browser.fixup.alternate.enabled", false);
/* 0803: display all parts of the url in the location bar ***/
user_pref("browser.urlbar.trimURLs", false);
-/* 0805: disable coloring of visited links - CSS history leak
- * [NOTE] This has NEVER been fully "resolved": in Mozilla/docs it is stated it's
- * only in 'certain circumstances', also see latest comments in [2]
- * [TEST] https://earthlng.github.io/testpages/visited_links.html (see github wiki APPENDIX A on how to use)
- * [1] https://dbaron.org/mozilla/visited-privacy
- * [2] https://bugzilla.mozilla.org/147777
- * [3] https://developer.mozilla.org/docs/Web/CSS/Privacy_and_the_:visited_selector ***/
-user_pref("layout.css.visited_links_enabled", false);
-/* 0807: disable live search suggestions
-/* [NOTE] Both must be true for the location bar to work
+/* 0804: disable live search suggestions
+ * [NOTE] Both must be true for the location bar to work
* [SETUP-CHROME] Change these if you trust and use a privacy respecting search engine
* [SETTING] Search>Provide search suggestions | Show search suggestions in address bar results ***/
user_pref("browser.search.suggest.enabled", false);
user_pref("browser.urlbar.suggest.searches", false);
-/* 0809: disable location bar suggesting "preloaded" top websites [FF54+]
- * [1] https://bugzilla.mozilla.org/1211726 ***/
-user_pref("browser.urlbar.usepreloadedtopurls.enabled", false);
-/* 0810: disable location bar making speculative connections [FF56+]
+/* 0805: disable location bar making speculative connections [FF56+]
* [1] https://bugzilla.mozilla.org/1348275 ***/
user_pref("browser.urlbar.speculativeConnect.enabled", false);
-/* 0811: disable location bar leaking single words to a DNS provider **after searching** [FF78+]
+/* 0806: disable location bar leaking single words to a DNS provider **after searching** [FF78+]
* 0=never resolve single words, 1=heuristic (default), 2=always resolve
- * [NOTE] For FF78 value 1 and 2 are the same and always resolve but that will change in future versions
* [1] https://bugzilla.mozilla.org/1642623 ***/
user_pref("browser.urlbar.dnsResolveSingleWordsAfterSearch", 0);
-/* 0850a: disable location bar suggestion types
- * [SETTING] Privacy & Security>Address Bar>When using the address bar, suggest ***/
- // user_pref("browser.urlbar.suggest.history", false);
- // user_pref("browser.urlbar.suggest.bookmark", false);
- // user_pref("browser.urlbar.suggest.openpage", false);
- // user_pref("browser.urlbar.suggest.topsites", false); // [FF78+]
-/* 0850c: disable location bar dropdown
- * This value controls the total number of entries to appear in the location bar dropdown
- * [NOTE] Items (bookmarks/history/openpages) with a high "frecency"/"bonus" will always
- * be displayed (no we do not know how these are calculated or what the threshold is),
- * and this does not affect the search by search engine suggestion (see 0807)
- * [NOTE] This setting is only useful if you want to enable search engine keywords
- * (i.e. at least one of 0850a suggestion types must be true) but you want to *limit* suggestions shown ***/
- // user_pref("browser.urlbar.maxRichResults", 0);
-/* 0850d: disable location bar autofill
- * [1] https://support.mozilla.org/en-US/kb/address-bar-autocomplete-firefox#w_url-autocomplete ***/
- // user_pref("browser.urlbar.autoFill", false);
-/* 0860: disable search and form history
- * [SETUP-WEB] Be aware thet autocomplete form data can be read by third parties, see [1] [2]
- * [NOTE] We also clear formdata on exit (see 2803)
+/* 0808: disable tab-to-search [FF85+]
+ * Alternatively, you can exclude on a per-engine basis by unchecking them in Options>Search
+ * [SETTING] Privacy & Security>Address Bar>When using the address bar, suggest>Search engines ***/
+ // user_pref("browser.urlbar.suggest.engines", false);
+/* 0810: disable search and form history
+ * [SETUP-WEB] Be aware that autocomplete form data can be read by third parties [1][2]
+ * [NOTE] We also clear formdata on exit (2803)
* [SETTING] Privacy & Security>History>Custom Settings>Remember search and form history
* [1] https://blog.mindedsecurity.com/2011/10/autocompleteagain.html
* [2] https://bugzilla.mozilla.org/381681 ***/
user_pref("browser.formfill.enable", false);
-/* 0862: disable browsing and download history
- * [NOTE] We also clear history and downloads on exiting Firefox (see 2803)
- * [SETTING] Privacy & Security>History>Custom Settings>Remember browsing and download history ***/
- // user_pref("places.history.enabled", false);
-/* 0870: disable Windows jumplist [WINDOWS] ***/
-user_pref("browser.taskbar.lists.enabled", false);
-user_pref("browser.taskbar.lists.frequent.enabled", false);
-user_pref("browser.taskbar.lists.recent.enabled", false);
-user_pref("browser.taskbar.lists.tasks.enabled", false);
-/* 0871: disable Windows taskbar preview [WINDOWS] ***/
-user_pref("browser.taskbar.previews.enable", false);
+/* 0811: disable Form Autofill
+ * [NOTE] Stored data is NOT secure (uses a JSON file)
+ * [NOTE] Heuristics controls Form Autofill on forms without @autocomplete attributes
+ * [SETTING] Privacy & Security>Forms and Autofill>Autofill addresses
+ * [1] https://wiki.mozilla.org/Firefox/Features/Form_Autofill ***/
+user_pref("extensions.formautofill.addresses.enabled", false); // [FF55+]
+user_pref("extensions.formautofill.available", "off"); // [FF56+]
+user_pref("extensions.formautofill.creditCards.available", false); // [FF57+]
+user_pref("extensions.formautofill.creditCards.enabled", false); // [FF56+]
+user_pref("extensions.formautofill.heuristics.enabled", false); // [FF55+]
+/* 0820: disable coloring of visited links
+ * [SETUP-HARDEN] Bulk rapid history sniffing was mitigated in 2010 [1][2]. Slower and more expensive
+ * redraw timing attacks were largely mitigated in FF77+ [3]. Using RFP (4501) further hampers timing
+ * attacks. Don't forget clearing history on close (2803). However, social engineering [2#limits][4][5]
+ * and advanced targeted timing attacks could still produce usable results
+ * [1] https://developer.mozilla.org/docs/Web/CSS/Privacy_and_the_:visited_selector
+ * [2] https://dbaron.org/mozilla/visited-privacy
+ * [3] https://bugzilla.mozilla.org/1632765
+ * [4] https://earthlng.github.io/testpages/visited_links.html (see github wiki APPENDIX A on how to use)
+ * [5] https://lcamtuf.blogspot.com/2016/08/css-mix-blend-mode-is-bad-for-keeping.html ***/
+ // user_pref("layout.css.visited_links_enabled", false);
-/*** [SECTION 0900]: PASSWORDS ***/
+/*** [SECTION 0900]: PASSWORDS
+ [1] https://support.mozilla.org/kb/use-primary-password-protect-stored-logins-and-pas
user_pref("_user.js.parrot", "0900 syntax error: the parrot's expired!");
-/* 0901: disable saving passwords
- * [NOTE] This does not clear any passwords already saved
- * [SETTING] Privacy & Security>Logins and Passwords>Ask to save logins and passwords for websites ***/
- // user_pref("signon.rememberSignons", false);
-/* 0902: use a master password
- * There are no preferences for this. It is all handled internally.
- * [SETTING] Privacy & Security>Logins and Passwords>Use a master password
- * [1] https://support.mozilla.org/kb/use-master-password-protect-stored-logins ***/
-/* 0903: set how often Firefox should ask for the master password
- * 0=the first time (default), 1=every time it's needed, 2=every n minutes (see 0904) ***/
+/* 0901: set when Firefox should prompt for the primary password
+ * 0=once per session (default), 1=every time it's needed, 2=after n minutes (0902) ***/
user_pref("security.ask_for_password", 2);
-/* 0904: set how often in minutes Firefox should ask for the master password (see 0903)
- * in minutes, default is 30 ***/
-user_pref("security.password_lifetime", 5);
-/* 0905: disable auto-filling username & password form fields
+/* 0902: set how long in minutes Firefox should remember the primary password (0901) ***/
+user_pref("security.password_lifetime", 5); // [DEFAULT: 30]
+/* 0903: disable auto-filling username & password form fields
* can leak in cross-site forms *and* be spoofed
* [NOTE] Username & password is still available when you enter the field
- * [SETTING] Privacy & Security>Logins and Passwords>Autofill logins and passwords ***/
+ * [SETTING] Privacy & Security>Logins and Passwords>Autofill logins and passwords
+ * [1] https://freedom-to-tinker.com/2017/12/27/no-boundaries-for-user-identities-web-trackers-exploit-browser-login-managers/ ***/
user_pref("signon.autofillForms", false);
-/* 0909: disable formless login capture for Password Manager [FF51+] ***/
+/* 0904: disable formless login capture for Password Manager [FF51+] ***/
user_pref("signon.formlessCapture.enabled", false);
-/* 0912: limit (or disable) HTTP authentication credentials dialogs triggered by sub-resources [FF41+]
+/* 0905: limit (or disable) HTTP authentication credentials dialogs triggered by sub-resources [FF41+]
* hardens against potential credentials phishing
- * 0=don't allow sub-resources to open HTTP authentication credentials dialogs
- * 1=don't allow cross-origin sub-resources to open HTTP authentication credentials dialogs
- * 2=allow sub-resources to open HTTP authentication credentials dialogs (default)
- * [1] https://www.fxsitecompat.com/en-CA/docs/2015/http-auth-dialog-can-no-longer-be-triggered-by-cross-origin-resources/ ***/
+ * 0 = don't allow sub-resources to open HTTP authentication credentials dialogs
+ * 1 = don't allow cross-origin sub-resources to open HTTP authentication credentials dialogs
+ * 2 = allow sub-resources to open HTTP authentication credentials dialogs (default) ***/
user_pref("network.auth.subresource-http-auth-allow", 1);
-/*** [SECTION 1000]: CACHE / SESSION (RE)STORE / FAVICONS
- Cache tracking/fingerprinting techniques [1][2][3] require a cache. Disabling disk (1001)
- *and* memory (1003) caches is one solution; but that's extreme and fingerprintable. A hardened
- Temporary Containers configuration can effectively do the same thing, by isolating every tab [4].
- We consider avoiding disk cache (1001) so cache is session/memory only (like Private Browsing
- mode), and isolating cache to first party (4001) is sufficient and a good balance between
- risk and performance. ETAGs can also be neutralized by modifying response headers [5], and
- you can clear the cache manually or on a regular basis with an extension.
+/* 0906: enforce no automatic authentication on Microsoft sites [FF91+] [WINDOWS 10+]
+ * [SETTING] Privacy & Security>Logins and Passwords>Allow Windows single sign-on for...
+ * [1] https://support.mozilla.org/kb/windows-sso ***/
+user_pref("network.http.windows-sso.enabled", false); // [DEFAULT: false]
- [1] https://en.wikipedia.org/wiki/HTTP_ETag#Tracking_using_ETags
- [2] https://robertheaton.com/2014/01/20/cookieless-user-tracking-for-douchebags/
- [3] https://www.grepular.com/Preventing_Web_Tracking_via_the_Browser_Cache
- [4] https://medium.com/@stoically/enhance-your-privacy-in-firefox-with-temporary-containers-33925cd6cd21
- [5] https://github.com/ghacksuserjs/ghacks-user.js/wiki/4.2.4-Header-Editor
+/*** [SECTION 1000]: DISK AVOIDANCE ***/
user_pref("_user.js.parrot", "1000 syntax error: the parrot's gone to meet 'is maker!");
/* 1001: disable disk cache
- * [SETUP-PERF] If you think disk cache may help (heavy tab user, high-res video),
- * or you use a hardened Temporary Containers, then feel free to override this
- * [NOTE] We also clear cache on exiting Firefox (see 2803) ***/
+ * [SETUP-CHROME] If you think disk cache helps perf, then feel free to override this
+ * [NOTE] We also clear cache on exit (2803) ***/
//;user_pref("browser.cache.disk.enable", false);
-/* 1003: disable memory cache
-/* capacity: -1=determine dynamically (default), 0=none, n=memory capacity in kilobytes ***/
- // user_pref("browser.cache.memory.enable", false);
- // user_pref("browser.cache.memory.capacity", 0); // [HIDDEN PREF ESR]
-/* 1006: disable permissions manager from writing to disk [RESTART]
- * [NOTE] This means any permission changes are session only
- * [1] https://bugzilla.mozilla.org/967812 ***/
- // user_pref("permissions.memory_only", true); // [HIDDEN PREF]
-/* 1007: disable media cache from writing to disk in Private Browsing
- * [NOTE] MSE (Media Source Extensions) are already stored in-memory in PB */
+/* 1002: disable media cache from writing to disk in Private Browsing
+ * [NOTE] MSE (Media Source Extensions) are already stored in-memory in PB
+ * [SETUP-WEB] ESR78: playback might break on subsequent loading (1650281) ***/
user_pref("browser.privatebrowsing.forceMediaMemoryCache", true); // [FF75+]
-user_pref("media.memory_cache_max_size", 16384);
-/** SESSIONS & SESSION RESTORE ***/
-/* 1020: exclude "Undo Closed Tabs" in Session Restore ***/
- // user_pref("browser.sessionstore.max_tabs_undo", 0);
-/* 1021: disable storing extra session data [SETUP-CHROME]
- * extra session data contains contents of forms, scrollbar positions, cookies and POST data
- * define on which sites to save extra session data:
+user_pref("media.memory_cache_max_size", 65536);
+/* 1003: disable storing extra session data [SETUP-CHROME]
+ * define on which sites to save extra session data such as form content, cookies and POST data
* 0=everywhere, 1=unencrypted sites, 2=nowhere ***/
//;user_pref("browser.sessionstore.privacy_level", 2);
-user_pref("browser.sessionstore.privacy_level", 0);
-/* 1022: disable resuming session from crash ***/
- // user_pref("browser.sessionstore.resume_from_crash", false);
-/* 1023: set the minimum interval between session save operations
- * Increasing this can help on older machines and some websites, as well as reducing writes, see [1]
- * Default is 15000 (15 secs). Try 30000 (30 secs), 60000 (1 min) etc
- * [SETUP-CHROME] This can also affect entries in the "Recently Closed Tabs" feature:
- * i.e. the longer the interval the more chance a quick tab open/close won't be captured.
- * This longer interval *may* affect history but we cannot replicate any history not recorded
+/* 1004: set the minimum interval between session save operations
+ * Increasing this can help on older machines and some websites, as well as reducing writes [1]
* [1] https://bugzilla.mozilla.org/1304389 ***/
-user_pref("browser.sessionstore.interval", 30000);
-/* 1024: disable automatic Firefox start and session restore after reboot [FF62+] [WINDOWS]
+user_pref("browser.sessionstore.interval", 30000); // [DEFAULT: 15000]
+/* 1005: disable automatic Firefox start and session restore after reboot [FF62+] [WINDOWS]
* [1] https://bugzilla.mozilla.org/603903 ***/
user_pref("toolkit.winRegisterApplicationRestart", false);
-/* 1030: disable favicons in shortcuts
+/* 1006: disable favicons in shortcuts
* URL shortcuts use a cached randomly named .ico file which is stored in your
- * profile/shortcutCache directory. The .ico remains after the shortcut is deleted.
+ * profile/shortcutCache directory. The .ico remains after the shortcut is deleted
* If set to false then the shortcuts use a generic Firefox icon ***/
user_pref("browser.shell.shortcutFavicons", false);
-/* 1031: disable favicons in history and bookmarks
- * Stored as data blobs in favicons.sqlite, these don't reveal anything that your
- * actual history (and bookmarks) already do. Your history is more detailed, so
- * control that instead; e.g. disable history, clear history on close, use PB mode
- * [NOTE] favicons.sqlite is sanitized on Firefox close, not in-session ***/
- // user_pref("browser.chrome.site_icons", false);
-/* 1032: disable favicons in web notifications ***/
- // user_pref("alerts.showFavicons", false); // [DEFAULT: false]
-/*** [SECTION 1200]: HTTPS (SSL/TLS / OCSP / CERTS / HPKP / CIPHERS)
+/*** [SECTION 1200]: HTTPS (SSL/TLS / OCSP / CERTS / HPKP)
Your cipher and other settings can be used in server side fingerprinting
[TEST] https://www.ssllabs.com/ssltest/viewMyClient.html
[TEST] https://browserleaks.com/ssl
user_pref("_user.js.parrot", "1200 syntax error: the parrot's a stiff!");
/** SSL (Secure Sockets Layer) / TLS (Transport Layer Security) ***/
/* 1201: require safe negotiation
- * Blocks connections to servers that don't support RFC 5746 [2] as they're potentially
- * vulnerable to a MiTM attack [3]. A server *without* RFC 5746 can be safe from the attack
- * if it disables renegotiations but the problem is that the browser can't know that.
- * Setting this pref to true is the only way for the browser to ensure there will be
+ * Blocks connections (SSL_ERROR_UNSAFE_NEGOTIATION) to servers that don't support RFC 5746 [2]
+ * as they're potentially vulnerable to a MiTM attack [3]. A server without RFC 5746 can be
+ * safe from the attack if it disables renegotiations but the problem is that the browser can't
+ * know that. Setting this pref to true is the only way for the browser to ensure there will be
* no unsafe renegotiations on the channel between the browser and the server.
+ * [STATS] SSL Labs (July 2021) reports over 99% of sites have secure renegotiation [4]
* [1] https://wiki.mozilla.org/Security:Renegotiation
* [2] https://tools.ietf.org/html/rfc5746
- * [3] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3555 ***/
+ * [3] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3555
+ * [4] https://www.ssllabs.com/ssl-pulse/ ***/
user_pref("security.ssl.require_safe_negotiation", true);
-/* 1202: control TLS versions with min and max
- * 1=TLS 1.0, 2=TLS 1.1, 3=TLS 1.2, 4=TLS 1.3
- * [STATS] Firefox telemetry (June 2020) shows only 0.16% of SSL handshakes use 1.0 or 1.1
- * [WARNING] Leave these at default, otherwise you alter your TLS fingerprint.
- * [1] https://www.ssllabs.com/ssl-pulse/ ***/
- // user_pref("security.tls.version.min", 3); // [DEFAULT: 3 FF78+]
- // user_pref("security.tls.version.max", 4);
-/* 1203: enforce TLS 1.0 and 1.1 downgrades as session only */
-user_pref("security.tls.version.enable-deprecated", false);
-/* 1204: disable SSL session tracking [FF36+]
- * SSL Session IDs are unique, last up to 24hrs in Firefox, and can be used for tracking
- * [SETUP-PERF] Relax this if you have FPI enabled (see 4000) *AND* you understand the
- * consequences. FPI isolates these, but it was designed with the Tor protocol in mind,
- * and the Tor Browser has extra protection, including enhanced sanitizing per Identity.
- * [1] https://tools.ietf.org/html/rfc5077
- * [2] https://bugzilla.mozilla.org/967977
- * [3] https://arxiv.org/abs/1810.07304 ***/
-user_pref("security.ssl.disable_session_identifiers", true); // [HIDDEN PREF]
-/* 1205: disable SSL Error Reporting
- * [1] https://firefox-source-docs.mozilla.org/browser/base/sslerrorreport/preferences.html ***/
-user_pref("security.ssl.errorReporting.automatic", false);
-user_pref("security.ssl.errorReporting.enabled", false);
-user_pref("security.ssl.errorReporting.url", "");
+/* 1203: reset TLS 1.0 and 1.1 downgrades i.e. session only ***/
+user_pref("security.tls.version.enable-deprecated", false); // [DEFAULT: false]
/* 1206: disable TLS1.3 0-RTT (round-trip time) [FF51+]
* [1] https://github.com/tlswg/tls13-spec/issues/1001
* [2] https://blog.cloudflare.com/tls-1-3-overview-and-q-and-a/ ***/
user_pref("security.tls.enable_0rtt_data", false);
/** OCSP (Online Certificate Status Protocol)
- #Required reading [#] https://scotthelme.co.uk/revocation-is-broken/ ***/
-/* 1210: enable OCSP Stapling
- * [1] https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/ ***/
-user_pref("security.ssl.enable_ocsp_stapling", true);
-/* 1211: control when to use OCSP fetching (to confirm current validity of certificates)
+ [1] https://scotthelme.co.uk/revocation-is-broken/
+ [2] https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/
+/* 1211: enforce OCSP fetching to confirm current validity of certificates
* 0=disabled, 1=enabled (default), 2=enabled for EV certificates only
* OCSP (non-stapled) leaks information about the sites you visit to the CA (cert authority)
* It's a trade-off between security (checking) and privacy (leaking info to the CA)
* [NOTE] This pref only controls OCSP fetching and does not affect OCSP stapling
+ * [SETTING] Privacy & Security>Security>Certificates>Query OCSP responder servers...
* [1] https://en.wikipedia.org/wiki/Ocsp ***/
-user_pref("security.OCSP.enabled", 1);
+user_pref("security.OCSP.enabled", 1); // [DEFAULT: 1]
/* 1212: set OCSP fetch failures (non-stapled, see 1211) to hard-fail [SETUP-WEB]
* When a CA cannot be reached to validate a cert, Firefox just continues the connection (=soft-fail)
* Setting this pref to true tells Firefox to instead terminate the connection (=hard-fail)
/** CERTS / HPKP (HTTP Public Key Pinning) ***/
/* 1220: disable or limit SHA-1 certificates
- * 0=all SHA1 certs are allowed
- * 1=all SHA1 certs are blocked
- * 2=deprecated option that now maps to 1
- * 3=only allowed for locally-added roots (e.g. anti-virus)
- * 4=only allowed for locally-added roots or for certs in 2015 and earlier
- * [SETUP-CHROME] When disabled, some man-in-the-middle devices (e.g. security scanners and
- * antivirus products, may fail to connect to HTTPS sites. SHA-1 is *almost* obsolete.
+ * 3 = only allow locally-added roots (e.g. anti-virus) (default)
+ * 4 = only allow locally-added roots or for certs in 2015 and earlier
+ * [SETUP-CHROME] If you have problems, update your software: SHA-1 is obsolete
* [1] https://blog.mozilla.org/security/2016/10/18/phasing-out-sha-1-on-the-public-web/ ***/
user_pref("security.pki.sha1_enforcement_level", 1);
/* 1221: disable Windows 8.1's Microsoft Family Safety cert [FF50+] [WINDOWS]
* 2=detect Family Safety mode and import the root
* [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/21686 ***/
user_pref("security.family_safety.mode", 0);
-/* 1222: disable intermediate certificate caching (fingerprinting attack vector) [FF41+] [RESTART]
- * [NOTE] This affects login/cert/key dbs. The effect is all credentials are session-only.
- * Saved logins and passwords are not available. Reset the pref and restart to return them.
- * [1] https://shiftordie.de/blog/2017/02/21/fingerprinting-firefox-users-with-cached-intermediate-ca-certificates-fiprinca/ ***/
- // user_pref("security.nocertdb", true); // [HIDDEN PREF]
-/* 1223: enforce strict pinning
- * PKP (Public Key Pinning) 0=disabled 1=allow user MiTM (such as your antivirus), 2=strict
+/* 1223: enable strict pinning
+ * PKP (Public Key Pinning) 0=disabled, 1=allow user MiTM (such as your antivirus), 2=strict
* [SETUP-WEB] If you rely on an AV (antivirus) to protect your web browsing
* by inspecting ALL your web traffic, then leave at current default=1
* [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/16206 ***/
user_pref("security.cert_pinning.enforcement_level", 2);
+/* 1224: enable CRLite [FF73+]
+ * In FF84+ it covers valid certs and in mode 2 doesn't fall back to OCSP
+ * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1429800,1670985
+ * [2] https://blog.mozilla.org/security/tag/crlite/ ***/
+user_pref("security.remote_settings.crlite_filters.enabled", true);
+user_pref("security.pki.crlite_mode", 2);
-/* 1240: disable insecure active content on https pages
- * [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/21323 ***/
-user_pref("security.mixed_content.block_active_content", true); // [DEFAULT: true]
/* 1241: disable insecure passive content (such as images) on https pages [SETUP-WEB] ***/
user_pref("security.mixed_content.block_display_content", true);
-/* 1243: block unencrypted requests from Flash on encrypted pages to mitigate MitM attacks [FF59+]
- * [1] https://bugzilla.mozilla.org/1190623 ***/
-user_pref("security.mixed_content.block_object_subrequest", true);
-/* 1244: enable https-only-mode [FF76+]
- * [NOTE] This is experimental
- * [1] https://bugzilla.mozilla.org/1613063 */
- // user_pref("dom.security.https_only_mode", true); // [FF76+]
- // user_pref("dom.security.https_only_mode.upgrade_local", true); // [FF77+]
-/** CIPHERS [WARNING: do not meddle with your cipher suite: see the section 1200 intro]
- * These are all the ciphers still using SHA-1 and CBC which are weaker than the available alternatives. (see "Cipher Suites" in [1])
- * Additionally some have other weaknesses like key sizes of 128 (or lower) [2] and/or no Perfect Forward Secrecy [3].
- * [1] https://browserleaks.com/ssl
- * [2] https://en.wikipedia.org/wiki/Key_size
- * [3] https://en.wikipedia.org/wiki/Forward_secrecy
-/* 1261: disable 3DES (effective key size < 128 and no PFS)
- * [1] https://en.wikipedia.org/wiki/3des#Security
- * [2] https://en.wikipedia.org/wiki/Meet-in-the-middle_attack
- * [3] https://www-archive.mozilla.org/projects/security/pki/nss/ssl/fips-ssl-ciphersuites.html ***/
- // user_pref("security.ssl3.rsa_des_ede3_sha", false);
-/* 1263: disable DHE (Diffie-Hellman Key Exchange)
- * [1] https://www.eff.org/deeplinks/2015/10/how-to-protect-yourself-from-nsa-attacks-1024-bit-DH ***/
- // user_pref("security.ssl3.dhe_rsa_aes_128_sha", false); // [DEFAULT: false FF78+]
- // user_pref("security.ssl3.dhe_rsa_aes_256_sha", false); // [DEFAULT: false FF78+]
-/* 1264: disable the remaining non-modern cipher suites as of FF78 (in order of preferred by FF) ***/
- // user_pref("security.ssl3.ecdhe_ecdsa_aes_256_sha", false);
- // user_pref("security.ssl3.ecdhe_ecdsa_aes_128_sha", false);
- // user_pref("security.ssl3.ecdhe_rsa_aes_128_sha", false);
- // user_pref("security.ssl3.ecdhe_rsa_aes_256_sha", false);
- // user_pref("security.ssl3.rsa_aes_128_sha", false); // no PFS
- // user_pref("security.ssl3.rsa_aes_256_sha", false); // no PFS
+/* 1244: enable HTTPS-Only mode in all windows [FF76+]
+ * When the top-level is HTTPS, insecure subresources are also upgraded (silent fail)
+ * [SETTING] to add site exceptions: Padlock>HTTPS-Only mode>On (after "Continue to HTTP Site")
+ * [SETTING] Privacy & Security>HTTPS-Only Mode (and manage exceptions)
+ * [TEST] http://example.com [upgrade]
+ * [TEST] http://neverssl.com/ [no upgrade] ***/
+user_pref("dom.security.https_only_mode", true); // [FF76+]
+ // user_pref("dom.security.https_only_mode_pbm", true); // [FF80+]
+/* 1245: enable HTTPS-Only mode for local resources [FF77+] ***/
+ // user_pref("dom.security.https_only_mode.upgrade_local", true);
+/* 1246: disable HTTP background requests [FF82+]
+ * When attempting to upgrade, if the server doesn't respond within 3 seconds,
+ * Firefox sends HTTP requests in order to check if the server supports HTTPS or not
+ * This is done to avoid waiting for a timeout which takes 90 seconds
+ * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1642387,1660945 ***/
+user_pref("dom.security.https_only_mode_send_http_background_request", false);
/** UI (User Interface) ***/
/* 1270: display warning on the padlock for "broken security" (if 1201 is false)
* Bug: warning padlock not indicated for subresources on a secure page! [2]
- * [STATS] SSL Labs (June 2020) reports 98.8% of sites have secure renegotiation [3]
* [1] https://wiki.mozilla.org/Security:Renegotiation
- * [2] https://bugzilla.mozilla.org/1353705
- * [3] https://www.ssllabs.com/ssl-pulse/ ***/
+ * [2] https://bugzilla.mozilla.org/1353705 ***/
user_pref("security.ssl.treat_unsafe_negotiation_as_broken", true);
/* 1271: control "Add Security Exception" dialog on SSL warnings
- * 0=do neither 1=pre-populate url 2=pre-populate url + pre-fetch cert (default)
+ * 0=do neither, 1=pre-populate url, 2=pre-populate url + pre-fetch cert (default)
* [1] https://github.com/pyllyukko/user.js/issues/210 ***/
user_pref("browser.ssl_override_behavior", 1);
/* 1272: display advanced information on Insecure Connection warning pages
* i.e. it doesn't work for HSTS discrepancies (https://subdomain.preloaded-hsts.badssl.com/)
* [TEST] https://expired.badssl.com/ ***/
user_pref("browser.xul.error_pages.expert_bad_cert", true);
-/* 1273: display "insecure" icon and "Not Secure" text on HTTP sites ***/
-user_pref("security.insecure_connection_icon.enabled", true); // [FF59+] [DEFAULT: true FF70+]
+/* 1273: display "Not Secure" text on HTTP sites ***/
user_pref("security.insecure_connection_text.enabled", true); // [FF60+]
/*** [SECTION 1400]: FONTS ***/
user_pref("_user.js.parrot", "1400 syntax error: the parrot's bereft of life!");
-/* 1401: disable websites choosing fonts (0=block, 1=allow)
- * This can limit most (but not all) JS font enumeration which is a high entropy fingerprinting vector
- * [SETUP-WEB] Can break some PDFs (missing text). Limiting to default fonts can "uglify" the web
- * [SETTING] General>Language and Appearance>Fonts & Colors>Advanced>Allow pages to choose... ***/
-user_pref("browser.display.use_document_fonts", 0);
-/* 1403: disable icon fonts (glyphs) and local fallback rendering
- * [1] https://bugzilla.mozilla.org/789788
- * [2] https://gitlab.torproject.org/legacy/trac/-/issues/8455 ***/
- // user_pref("gfx.downloadable_fonts.enabled", false); // [FF41+]
- // user_pref("gfx.downloadable_fonts.fallback_delay", -1);
-/* 1404: disable rendering of SVG OpenType fonts
- * [1] https://wiki.mozilla.org/SVGOpenTypeFonts - iSECPartnersReport recommends to disable this ***/
+/* 1401: disable rendering of SVG OpenType fonts ***/
user_pref("gfx.font_rendering.opentype_svg.enabled", false);
-/* 1408: disable graphite
- * Graphite has had many critical security issues in the past, see [1]
- * [1] https://www.mozilla.org/security/advisories/mfsa2017-15/#CVE-2017-7778
- * [2] https://en.wikipedia.org/wiki/Graphite_(SIL) ***/
-user_pref("gfx.font_rendering.graphite.enabled", false);
-/* 1409: limit system font exposure to a whitelist [FF52+] [RESTART]
- * If the whitelist is empty, then whitelisting is considered disabled and all fonts are allowed.
- * [WARNING] Creating your own probably highly-unique whitelist will raise your entropy.
- * Eventually privacy.resistFingerprinting (see 4500) will cover this
- * [1] https://bugzilla.mozilla.org/1121643 ***/
- // user_pref("font.system.whitelist", ""); // [HIDDEN PREF]
+/* 1402: limit font visibility (Windows, Mac, some Linux) [FF79+]
+ * [NOTE] In FF80+ RFP ignores the pref and uses value 1
+ * Uses hardcoded lists with two parts: kBaseFonts + kLangPackFonts [1], bundled fonts are auto-allowed
+ * 1=only base system fonts, 2=also fonts from optional language packs, 3=also user-installed fonts
+ * [1] https://searchfox.org/mozilla-central/search?path=StandardFonts*.inc ***/
+ // user_pref("layout.css.font-visibility.level", 1);
/*** [SECTION 1600]: HEADERS / REFERERS
- Only *cross domain* referers need controlling: leave 1601, 1602, 1605 and 1606 alone
- harden it a bit: set XOriginPolicy (1603) to 1 (as per the settings below)
- harden it a bit more: set XOriginPolicy (1603) to 2 (and optionally 1604 to 1 or 2), expect breakage
- If you want any REAL control over referers and breakage, then use an extension. Either:
- uMatrix: limited by scope, all requests are spoofed or not-spoofed
- Smart Referrer: granular with source<->destination, whitelists
- full URI: https://example.com:8888/foo/bar.html?id=1234
- scheme+host+port+path: https://example.com:8888/foo/bar.html
- scheme+host+port: https://example.com:8888
- #Required reading [#] https://feeding.cloud.geek.nz/posts/tweaking-referrer-for-privacy-in-firefox/
+ Expect some breakage e.g. banks: use an extension if you need precise control
+ full URI: https://example.com:8888/foo/bar.html?id=1234
+ scheme+host+port+path: https://example.com:8888/foo/bar.html
+ scheme+host+port: https://example.com:8888
+ [1] https://feeding.cloud.geek.nz/posts/tweaking-referrer-for-privacy-in-firefox/
user_pref("_user.js.parrot", "1600 syntax error: the parrot rests in peace!");
-/* 1601: ALL: control when images/links send a referer
- * 0=never, 1=send only when links are clicked, 2=for links and images (default) ***/
- // user_pref("network.http.sendRefererHeader", 2); // [DEFAULT: 2]
-/* 1602: ALL: control the amount of information to send
- * 0=send full URI (default), 1=scheme+host+port+path, 2=scheme+host+port ***/
- // user_pref("network.http.referer.trimmingPolicy", 0); // [DEFAULT: 0]
-/* 1603: CROSS ORIGIN: control when to send a referer
+/* 1601: control when to send a cross-origin referer
* 0=always (default), 1=only if base domains match, 2=only if hosts match
- * [SETUP-WEB] Known to cause issues with older modems/routers and some sites e.g vimeo, icloud ***/
-user_pref("network.http.referer.XOriginPolicy", 1);
-/* 1604: CROSS ORIGIN: control the amount of information to send [FF52+]
+ * [SETUP-WEB] Known to cause issues with older modems/routers and some sites e.g vimeo, icloud, instagram ***/
+user_pref("network.http.referer.XOriginPolicy", 2);
+/* 1602: control the amount of cross-origin information to send [FF52+]
* 0=send full URI (default), 1=scheme+host+port+path, 2=scheme+host+port ***/
-user_pref("network.http.referer.XOriginTrimmingPolicy", 0); // [DEFAULT: 0]
-/* 1605: ALL: disable spoofing a referer
- * [WARNING] Do not set this to true, as spoofing effectively disables the anti-CSRF
- * (Cross-Site Request Forgery) protections that some sites may rely on ***/
- // user_pref("network.http.referer.spoofSource", false); // [DEFAULT: false]
-/* 1606: ALL: set the default Referrer Policy [FF59+]
- * 0=no-referer, 1=same-origin, 2=strict-origin-when-cross-origin, 3=no-referrer-when-downgrade
- * [NOTE] This is only a default, it can be overridden by a site-controlled Referrer Policy
- * [1] https://www.w3.org/TR/referrer-policy/
- * [2] https://developer.mozilla.org/docs/Web/HTTP/Headers/Referrer-Policy
- * [3] https://blog.mozilla.org/security/2018/01/31/preventing-data-leaks-by-stripping-path-information-in-http-referrers/ ***/
- // user_pref("network.http.referer.defaultPolicy", 3); // [DEFAULT: 3]
- // user_pref("network.http.referer.defaultPolicy.pbmode", 2); // [DEFAULT: 2]
-/* 1607: TOR: hide (not spoof) referrer when leaving a .onion domain [FF54+]
- * [NOTE] Firefox cannot access .onion sites by default. We recommend you use
- * the Tor Browser which is specifically designed for hidden services
- * [1] https://bugzilla.mozilla.org/1305144 ***/
-user_pref("network.http.referer.hideOnionSource", true);
-/* 1610: ALL: enable the DNT (Do Not Track) HTTP header
- * [NOTE] DNT is enforced with Enhanced Tracking Protection regardless of this pref
+user_pref("network.http.referer.XOriginTrimmingPolicy", 2);
+/* 1603: enable the DNT (Do Not Track) HTTP header
+ * [NOTE] DNT is enforced with Enhanced Tracking Protection (2710)
* [SETTING] Privacy & Security>Enhanced Tracking Protection>Send websites a "Do Not Track" signal... ***/
-user_pref("privacy.donottrackheader.enabled", true);
+ // user_pref("privacy.donottrackheader.enabled", true);
/*** [SECTION 1700]: CONTAINERS
- If you want to *really* leverage containers, we highly recommend Temporary Containers [2].
- Read the article by the extension author [3], and check out the github wiki/repo [4].
- [1] https://wiki.mozilla.org/Security/Contextual_Identity_Project/Containers
- [2] https://addons.mozilla.org/firefox/addon/temporary-containers/
- [3] https://medium.com/@stoically/enhance-your-privacy-in-firefox-with-temporary-containers-33925cd6cd21
- [4] https://github.com/stoically/temporary-containers/wiki
+ Check out Temporary Containers [2], read the article [3], and visit the wiki/repo [4]
+ [1] https://wiki.mozilla.org/Security/Contextual_Identity_Project/Containers
+ [2] https://addons.mozilla.org/firefox/addon/temporary-containers/
+ [3] https://medium.com/@stoically/enhance-your-privacy-in-firefox-with-temporary-containers-33925cd6cd21
+ [4] https://github.com/stoically/temporary-containers/wiki
user_pref("_user.js.parrot", "1700 syntax error: the parrot's bit the dust!");
-/* 1701: enable Container Tabs setting in preferences (see 1702) [FF50+]
- * [1] https://bugzilla.mozilla.org/1279029 ***/
-user_pref("privacy.userContext.ui.enabled", true);
-/* 1702: enable Container Tabs [FF50+]
+/* 1701: enable Container Tabs and its UI setting [FF50+]
* [SETTING] General>Tabs>Enable Container Tabs ***/
user_pref("privacy.userContext.enabled", true);
-/* 1703: set behaviour on "+ Tab" button to display container menu on left click [FF74+]
+user_pref("privacy.userContext.ui.enabled", true);
+/* 1702: set behaviour on "+ Tab" button to display container menu on left click [FF74+]
* [NOTE] The menu is always shown on long press and right click
* [SETTING] General>Tabs>Enable Container Tabs>Settings>Select a container for each new tab ***/
// user_pref("privacy.userContext.newTabContainerOnLeftClick.enabled", true);
-/*** [SECTION 1800]: PLUGINS ***/
-user_pref("_user.js.parrot", "1800 syntax error: the parrot's pushing up daisies!");
-/* 1803: disable Flash plugin
- * 0=deactivated, 1=ask, 2=enabled
- * ESR52.x is the last branch to *fully* support NPAPI, FF52+ stable only supports Flash
- * [NOTE] You can still override individual sites via site permissions
- * [1] https://www.ghacks.net/2013/07/09/how-to-make-sure-that-a-firefox-plugin-never-activates-again/ ***/
-user_pref("plugin.state.flash", 0);
-/* 1820: disable GMP (Gecko Media Plugins)
- * [1] https://wiki.mozilla.org/GeckoMediaPlugins ***/
- // user_pref("media.gmp-provider.enabled", false);
-/* 1825: disable widevine CDM (Content Decryption Module)
- * [SETUP-WEB] if you *need* CDM, e.g. Netflix, Amazon Prime, Hulu, whatever ***/
-user_pref("media.gmp-widevinecdm.visible", false);
-user_pref("media.gmp-widevinecdm.enabled", false);
-/* 1830: disable all DRM content (EME: Encryption Media Extension)
- * [SETUP-WEB] if you *need* EME, e.g. Netflix, Amazon Prime, Hulu, whatever
- * [SETTING] General>DRM Content>Play DRM-controlled content
- * [1] https://www.eff.org/deeplinks/2017/10/drms-dead-canary-how-we-just-lost-web-what-we-learned-it-and-what-we-need-do-next ***/
-user_pref("media.eme.enabled", false);
-/*** [SECTION 2000]: MEDIA / CAMERA / MIC ***/
+/*** [SECTION 2000]: PLUGINS / MEDIA / WEBRTC ***/
user_pref("_user.js.parrot", "2000 syntax error: the parrot's snuffed it!");
/* 2001: disable WebRTC (Web Real-Time Communication)
* [SETUP-WEB] WebRTC can leak your IP address from behind your VPN, but if this is not
* [1] https://www.privacytools.io/#webrtc ***/
user_pref("media.peerconnection.enabled", false);
/* 2002: limit WebRTC IP leaks if using WebRTC
- * In FF70+ these settings match Mode 4 (Mode 3 in older versions) (see [3])
+ * In FF70+ these settings match Mode 4 (Mode 3 in older versions) [3]
* [TEST] https://browserleaks.com/webrtc
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1189041,1297416,1452713
* [2] https://wiki.mozilla.org/Media/WebRTC/Privacy
user_pref("media.peerconnection.ice.default_address_only", true);
user_pref("media.peerconnection.ice.no_host", true); // [FF51+]
user_pref("media.peerconnection.ice.proxy_only_if_behind_proxy", true); // [FF70+]
-/* 2010: disable WebGL (Web Graphics Library)
- * [SETUP-WEB] When disabled, may break some websites. When enabled, provides high entropy,
- * especially with readPixels(). Some of the other entropy is lessened with RFP (see 4501)
- * [1] https://www.contextis.com/resources/blog/webgl-new-dimension-browser-exploitation/
- * [2] https://security.stackexchange.com/questions/13799/is-webgl-a-security-concern ***/
-user_pref("webgl.disabled", true);
-user_pref("webgl.enable-webgl2", false);
-/* 2012: limit WebGL ***/
-user_pref("webgl.min_capability_mode", true);
-user_pref("webgl.disable-fail-if-major-performance-caveat", true);
-/* 2022: disable screensharing ***/
-user_pref("media.getusermedia.screensharing.enabled", false);
-user_pref("media.getusermedia.browser.enabled", false);
-user_pref("media.getusermedia.audiocapture.enabled", false);
-/* 2024: set a default permission for Camera/Microphone [FF58+]
- * 0=always ask (default), 1=allow, 2=block
- * [SETTING] to add site exceptions: Page Info>Permissions>Use the Camera/Microphone
- * [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Camera/Microphone>Settings ***/
- // user_pref("permissions.default.camera", 2);
- // user_pref("permissions.default.microphone", 2);
+/* 2020: disable GMP (Gecko Media Plugins)
+ * [1] https://wiki.mozilla.org/GeckoMediaPlugins ***/
+ // user_pref("media.gmp-provider.enabled", false);
+/* 2021: disable widevine CDM (Content Decryption Module)
+ * [NOTE] This is covered by the EME master switch (2022) ***/
+ // user_pref("media.gmp-widevinecdm.enabled", false);
+/* 2022: disable all DRM content (EME: Encryption Media Extension)
+ * [SETUP-WEB] e.g. Netflix, Amazon Prime, Hulu, HBO, Disney+, Showtime, Starz, DirectTV
+ * [SETTING] General>DRM Content>Play DRM-controlled content
+ * [TEST] https://bitmovin.com/demos/drm
+ * [1] https://www.eff.org/deeplinks/2017/10/drms-dead-canary-how-we-just-lost-web-what-we-learned-it-and-what-we-need-do-next ***/
+user_pref("media.eme.enabled", false);
/* 2030: disable autoplay of HTML5 media [FF63+]
- * 0=Allow all, 1=Block non-muted media (default in FF67+), 2=Prompt (removed in FF66), 5=Block all (FF69+)
+ * 0=Allow all, 1=Block non-muted media (default), 5=Block all
* [NOTE] You can set exceptions under site permissions
* [SETTING] Privacy & Security>Permissions>Autoplay>Settings>Default for all websites ***/
// user_pref("media.autoplay.default", 5);
/* 2031: disable autoplay of HTML5 media if you interacted with the site [FF78+]
* 0=sticky (default), 1=transient, 2=user
- * [NOTE] If you have trouble with some video sites, then add an exception (see 2030)
- * [1] https://html.spec.whatwg.org/multipage/interaction.html#sticky-activation ***/
+ * Firefox's Autoplay Policy Documentation [PDF] is linked below via SUMO
+ * [NOTE] If you have trouble with some video sites, then add an exception (2030)
+ * [1] https://support.mozilla.org/questions/1293231 ***/
user_pref("media.autoplay.blocking_policy", 2);
-/*** [SECTION 2200]: WINDOW MEDDLING & LEAKS / POPUPS ***/
-user_pref("_user.js.parrot", "2200 syntax error: the parrot's 'istory!");
-/* 2201: prevent websites from disabling new window features ***/
-user_pref("dom.disable_window_open_feature.close", true);
-user_pref("dom.disable_window_open_feature.location", true); // [DEFAULT: true]
-user_pref("dom.disable_window_open_feature.menubar", true);
-user_pref("dom.disable_window_open_feature.minimizable", true);
-user_pref("dom.disable_window_open_feature.personalbar", true); // bookmarks toolbar
-user_pref("dom.disable_window_open_feature.resizable", true); // [DEFAULT: true]
-user_pref("dom.disable_window_open_feature.status", true); // [DEFAULT: true]
-user_pref("dom.disable_window_open_feature.titlebar", true);
-user_pref("dom.disable_window_open_feature.toolbar", true);
-/* 2202: prevent scripts from moving and resizing open windows ***/
-user_pref("dom.disable_window_move_resize", true);
-/* 2203: open links targeting new windows in a new tab instead
- * This stops malicious window sizes and some screen resolution leaks.
- * You can still right-click a link and open in a new window.
- * [TEST] https://ghacksuserjs.github.io/TorZillaPrint/TorZillaPrint.html#screen
- * [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/9881 ***/
-user_pref("browser.link.open_newwindow", 3);
-user_pref("browser.link.open_newwindow.restriction", 0);
-/* 2204: disable Fullscreen API (requires user interaction) to prevent screen-resolution leaks
- * [NOTE] You can still manually toggle the browser's fullscreen state (F11),
- * but this pref will disable embedded video/game fullscreen controls, e.g. youtube
- * [TEST] https://ghacksuserjs.github.io/TorZillaPrint/TorZillaPrint.html#screen ***/
- // user_pref("full-screen-api.enabled", false);
-/* 2210: block popup windows
- * [SETTING] Privacy & Security>Permissions>Block pop-up windows ***/
-user_pref("dom.disable_open_during_load", true);
-/* 2212: limit events that can cause a popup [SETUP-WEB]
- * default is "change click dblclick auxclick mouseup pointerup notificationclick reset submit touchend contextmenu" ***/
-user_pref("dom.popup_allowed_events", "click dblclick");
+/*** [SECTION 2300]: WEB WORKERS
+ A worker is a JS "background task" running in a global context, i.e. it is different from
+ the current window. Workers can spawn new workers (must be the same origin & scheme),
+ including service and shared workers. Shared workers can be utilized by multiple scripts and
+ communicate between browsing contexts (windows/tabs/iframes) and can even control your cache.
-/*** [SECTION 2300]: WEB WORKERS
- A worker is a JS "background task" running in a global context, i.e. it is different from
- the current window. Workers can spawn new workers (must be the same origin & scheme),
- including service and shared workers. Shared workers can be utilized by multiple scripts and
- communicate between browsing contexts (windows/tabs/iframes) and can even control your cache.
- [NOTE] uMatrix 1.2.0+ allows a per-scope control for workers (2301-deprecated) and service workers (2302)
- #Required reading [#] https://github.com/gorhill/uMatrix/releases/tag/1.2.0
- [1] Web Workers: https://developer.mozilla.org/docs/Web/API/Web_Workers_API
- [2] Worker: https://developer.mozilla.org/docs/Web/API/Worker
- [3] Service Worker: https://developer.mozilla.org/docs/Web/API/Service_Worker_API
- [4] SharedWorker: https://developer.mozilla.org/docs/Web/API/SharedWorker
- [5] ChromeWorker: https://developer.mozilla.org/docs/Web/API/ChromeWorker
- [6] Notifications: https://support.mozilla.org/questions/1165867#answer-981820
+ [1] Web Workers: https://developer.mozilla.org/docs/Web/API/Web_Workers_API
+ [2] Worker: https://developer.mozilla.org/docs/Web/API/Worker
+ [3] Service Worker: https://developer.mozilla.org/docs/Web/API/Service_Worker_API
+ [4] SharedWorker: https://developer.mozilla.org/docs/Web/API/SharedWorker
+ [5] ChromeWorker: https://developer.mozilla.org/docs/Web/API/ChromeWorker
+ [6] Notifications: https://support.mozilla.org/questions/1165867#answer-981820
user_pref("_user.js.parrot", "2300 syntax error: the parrot's off the twig!");
/* 2302: disable service workers [FF32, FF44-compat]
* Service workers essentially act as proxy servers that sit between web apps, and the
- * browser and network, are event driven, and can control the web page/site it is associated
+ * browser and network, are event driven, and can control the web page/site they are associated
* with, intercepting and modifying navigation and resource requests, and caching resources.
- * [NOTE] Service worker APIs are hidden (in Firefox) and cannot be used when in PB mode.
- * [NOTE] Service workers only run over HTTPS. Service workers have no DOM access.
+ * [NOTE] Service workers require HTTPS, have no DOM access, and are not supported in PB mode [1]
* [SETUP-WEB] Disabling service workers will break some sites. This pref is required true for
* service worker notifications (2304), push notifications (disabled, 2305) and service worker
- * cache (2740). If you enable this pref, then check those settings as well ***/
+ * cache (2740). If you enable this pref, then check those settings as well
+ * [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1320796#c7 ***/
user_pref("dom.serviceWorkers.enabled", false);
/* 2304: disable Web Notifications
- * [NOTE] Web Notifications can also use service workers (2302) and are behind a prompt (2306)
+ * [NOTE] Web Notifications can also use service workers (2302) and are behind a prompt (7002)
* [1] https://developer.mozilla.org/docs/Web/API/Notifications_API ***/
// user_pref("dom.webnotifications.enabled", false); // [FF22+]
// user_pref("dom.webnotifications.serviceworker.enabled", false); // [FF44+]
/* 2305: disable Push Notifications [FF44+]
* Push is an API that allows websites to send you (subscribed) messages even when the site
- * isn't loaded, by pushing messages to your userAgentID through Mozilla's Push Server.
+ * isn't loaded, by pushing messages to your userAgentID through Mozilla's Push Server
* [NOTE] Push requires service workers (2302) to subscribe to and display, and is behind
- * a prompt (2306). Disabling service workers alone doesn't stop Firefox polling the
- * Mozilla Push Server. To remove all subscriptions, reset your userAgentID (in about:config
- * or on start), and you will get a new one within a few seconds.
- * [1] https://support.mozilla.org/en-US/kb/push-notifications-firefox
- * [2] https://developer.mozilla.org/en-US/docs/Web/API/Push_API ***/
+ * a prompt (7002). Disabling service workers alone doesn't stop Firefox polling the
+ * Mozilla Push Server. To remove all subscriptions, reset your userAgentID.
+ * [1] https://support.mozilla.org/kb/push-notifications-firefox
+ * [2] https://developer.mozilla.org/docs/Web/API/Push_API ***/
user_pref("dom.push.enabled", false);
// user_pref("dom.push.userAgentID", "");
-/* 2306: set a default permission for Notifications (both 2304 and 2305) [FF58+]
- * 0=always ask (default), 1=allow, 2=block
- * [NOTE] Best left at default "always ask", fingerprintable via Permissions API
- * [SETTING] to add site exceptions: Page Info>Permissions>Receive Notifications
- * [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Notifications>Settings ***/
- // user_pref("permissions.default.desktop-notification", 2);
-/*** [SECTION 2400]: DOM (DOCUMENT OBJECT MODEL) & JAVASCRIPT ***/
+/*** [SECTION 2400]: DOM (DOCUMENT OBJECT MODEL) ***/
user_pref("_user.js.parrot", "2400 syntax error: the parrot's kicked the bucket!");
-/* 2401: disable website control over browser right-click context menu
- * [NOTE] Shift-Right-Click will always bring up the browser right-click context menu ***/
- // user_pref("dom.event.contextmenu.enabled", false);
-/* 2402: disable website access to clipboard events/content [SETUP-HARDEN]
- * [NOTE] This will break some sites' functionality e.g. Outlook, Twitter, Facebook, Wordpress
- * This applies to onCut/onCopy/onPaste events - i.e. it requires interaction with the website
- * [WARNING] If both 'middlemouse.paste' and 'general.autoScroll' are true (at least one
- * is default false) then enabling this pref can leak clipboard content, see [2]
- * [1] https://www.ghacks.net/2014/01/08/block-websites-reading-modifying-clipboard-contents-firefox/
- * [2] https://bugzilla.mozilla.org/1528289 */
- // user_pref("dom.event.clipboardevents.enabled", false);
-user_pref("dom.event.clipboardevents.enabled", false);
-/* 2404: disable clipboard commands (cut/copy) from "non-privileged" content [FF41+]
- * this disables document.execCommand("cut"/"copy") to protect your clipboard
- * [1] https://bugzilla.mozilla.org/1170911 ***/
-user_pref("dom.allow_cut_copy", false);
-/* 2405: disable "Confirm you want to leave" dialog on page close
- * Does not prevent JS leaks of the page close event.
- * [1] https://developer.mozilla.org/docs/Web/Events/beforeunload
- * [2] https://support.mozilla.org/questions/1043508 ***/
+/* 2401: disable "Confirm you want to leave" dialog on page close
+ * Does not prevent JS leaks of the page close event
+ * [1] https://developer.mozilla.org/docs/Web/Events/beforeunload ***/
user_pref("dom.disable_beforeunload", true);
-/* 2414: disable shaking the screen ***/
-user_pref("dom.vibrator.enabled", false);
-/* 2420: disable asm.js [FF22+] [SETUP-PERF]
- * [1] http://asmjs.org/
- * [2] https://www.mozilla.org/security/advisories/mfsa2015-29/
- * [3] https://www.mozilla.org/security/advisories/mfsa2015-50/
- * [4] https://www.mozilla.org/security/advisories/mfsa2017-01/#CVE-2017-5375
- * [5] https://www.mozilla.org/security/advisories/mfsa2017-05/#CVE-2017-5400
- * [6] https://rh0dev.github.io/blog/2017/the-return-of-the-jit/ ***/
-//;user_pref("javascript.options.asmjs", false);
-/* 2421: disable Ion and baseline JIT to harden against JS exploits [SETUP-HARDEN]
- * [NOTE] In FF75+, when **both** Ion and JIT are disabled, **and** the new
- * hidden pref is enabled, then Ion can still be used by extensions (1599226)
- * [WARNING] Disabling Ion/JIT can cause some site issues and performance loss
- * [1] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-0817 ***/
- // user_pref("javascript.options.ion", false);
- // user_pref("javascript.options.baselinejit", false);
- // user_pref("javascript.options.jit_trustedprincipals", true); // [FF75+] [HIDDEN PREF]
-/* 2422: disable WebAssembly [FF52+] [SETUP-PERF]
- * [NOTE] In FF71+ this no longer affects extensions (1576254)
- * [1] https://developer.mozilla.org/docs/WebAssembly ***/
-user_pref("javascript.options.wasm", false);
-/* 2426: disable Intersection Observer API [FF55+]
- * [1] https://developer.mozilla.org/docs/Web/API/Intersection_Observer_API
- * [2] https://w3c.github.io/IntersectionObserver/
- * [3] https://bugzilla.mozilla.org/1243846 ***/
- // user_pref("dom.IntersectionObserver.enabled", false);
-/* 2429: enable (limited but sufficient) window.opener protection [FF65+]
- * Makes rel=noopener implicit for target=_blank in anchor and area elements when no rel attribute is set ***/
-user_pref("dom.targetBlankNoOpener.enabled", true); // [DEFAULT: true FF78+]
-/*** [SECTION 2500]: HARDWARE FINGERPRINTING ***/
-user_pref("_user.js.parrot", "2500 syntax error: the parrot's shuffled off 'is mortal coil!");
-/* 2502: disable Battery Status API
- * Initially a Linux issue (high precision readout) that was fixed.
- * However, it is still another metric for fingerprinting, used to raise entropy.
- * e.g. do you have a battery or not, current charging status, charge level, times remaining etc
- * [NOTE] From FF52+ Battery Status API is only available in chrome/privileged code. see [1]
- * [1] https://bugzilla.mozilla.org/1313580 ***/
- // user_pref("dom.battery.enabled", false);
-/* 2505: disable media device enumeration [FF29+]
- * [NOTE] media.peerconnection.enabled should also be set to false (see 2001)
- * [1] https://wiki.mozilla.org/Media/getUserMedia
- * [2] https://developer.mozilla.org/docs/Web/API/MediaDevices/enumerateDevices ***/
-user_pref("media.navigator.enabled", false);
-/* 2508: disable hardware acceleration to reduce graphics fingerprinting [SETUP-HARDEN]
- * [WARNING] Affects text rendering (fonts will look different), impacts video performance,
- * and parts of Quantum that utilize the GPU will also be affected as they are rolled out
- * [SETTING] General>Performance>Custom>Use hardware acceleration when available
- * [1] https://wiki.mozilla.org/Platform/GFX/HardwareAcceleration ***/
- // user_pref("gfx.direct2d.disabled", true); // [WINDOWS]
- // user_pref("layers.acceleration.disabled", true);
-/* 2510: disable Web Audio API [FF51+]
- * [1] https://bugzilla.mozilla.org/1288359 ***/
-//;user_pref("dom.webaudio.enabled", false);
-/* 2517: disable Media Capabilities API [FF63+]
- * [WARNING] This *may* affect media performance if disabled, no one is sure
- * [1] https://github.com/WICG/media-capabilities
- * [2] https://wicg.github.io/media-capabilities/#security-privacy-considerations ***/
- // user_pref("media.media-capabilities.enabled", false);
-/* 2520: disable virtual reality devices
- * Optional protection depending on your connected devices
- * [1] https://developer.mozilla.org/docs/Web/API/WebVR_API ***/
- // user_pref("dom.vr.enabled", false);
-/* 2521: set a default permission for Virtual Reality (see 2520) [FF73+]
- * 0=always ask (default), 1=allow, 2=block
- * [SETTING] to add site exceptions: Page Info>Permissions>Access Virtual Reality Devices
- * [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Virtual Reality>Settings ***/
- // user_pref("permissions.default.xr", 0);
+/* 2402: prevent scripts from moving and resizing open windows ***/
+user_pref("dom.disable_window_move_resize", true);
+/* 2403: block popup windows
+ * [SETTING] Privacy & Security>Permissions>Block pop-up windows ***/
+user_pref("dom.disable_open_during_load", true);
+/* 2404: limit events that can cause a popup [SETUP-WEB] ***/
+user_pref("dom.popup_allowed_events", "click dblclick mousedown pointerdown");
/*** [SECTION 2600]: MISCELLANEOUS ***/
user_pref("_user.js.parrot", "2600 syntax error: the parrot's run down the curtain!");
/* 2601: prevent accessibility services from accessing your browser [RESTART]
- * [SETTING] Privacy & Security>Permissions>Prevent accessibility services from accessing your browser
+ * [SETTING] Privacy & Security>Permissions>Prevent accessibility services from accessing your browser (FF80 or lower)
* [1] https://support.mozilla.org/kb/accessibility-services ***/
user_pref("accessibility.force_disabled", 1);
/* 2602: disable sending additional analytics to web servers
/* 2603: remove temp files opened with an external application
* [1] https://bugzilla.mozilla.org/302433 ***/
user_pref("browser.helperApps.deleteTempFileOnExit", true);
-/* 2604: disable page thumbnail collection
- * look in profile/thumbnails directory - you may want to clean that out ***/
+/* 2604: disable page thumbnail collection ***/
user_pref("browser.pagethumbnails.capturing_disabled", true); // [HIDDEN PREF]
/* 2606: disable UITour backend so there is no chance that a remote page can use it ***/
user_pref("browser.uitour.enabled", false);
* [SETTING] Devtools>Advanced Settings>Enable browser chrome and add-on debugging toolboxes
* [1] https://github.com/pyllyukko/user.js/issues/179#issuecomment-246468676 ***/
user_pref("devtools.chrome.enabled", false);
-/* 2608: disable remote debugging
+/* 2608: reset remote debugging to disabled
* [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/16222 ***/
user_pref("devtools.debugger.remote-enabled", false); // [DEFAULT: false]
-/* 2609: disable MathML (Mathematical Markup Language) [FF51+] [SETUP-HARDEN]
- * [TEST] https://ghacksuserjs.github.io/TorZillaPrint/TorZillaPrint.html#misc
- * [1] https://bugzilla.mozilla.org/1173199 ***/
- // user_pref("mathml.disabled", true);
-/* 2610: disable in-content SVG (Scalable Vector Graphics) [FF53+]
- * [NOTE] In FF70+ and ESR68.1.0+ this no longer affects extensions (1564208)
- * [WARNING] Expect breakage incl. youtube player controls. Best left for a "hardened" profile.
- * [1] https://bugzilla.mozilla.org/1216893 ***/
- // user_pref("svg.disabled", true);
/* 2611: disable middle mouse click opening links from clipboard
* [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/10089 ***/
user_pref("middlemouse.contentLoadURL", false);
-/* 2614: limit HTTP redirects (this does not control redirects with HTML meta tags or JS)
- * [NOTE] A low setting of 5 or under will probably break some sites (e.g. gmail logins)
- * To control HTML Meta tag and JS redirects, use an extension. Default is 20 ***/
-user_pref("network.http.redirection-limit", 10);
/* 2615: disable websites overriding Firefox's keyboard shortcuts [FF58+]
* 0 (default) or 1=allow, 2=block
- * [SETTING] to add site exceptions: Page Info>Permissions>Override Keyboard Shortcuts ***/
+ * [SETTING] to add site exceptions: Ctrl+I>Permissions>Override Keyboard Shortcuts ***/
// user_pref("permissions.default.shortcuts", 2);
/* 2616: remove special permissions for certain mozilla domains [FF35+]
* [1] resource://app/defaults/permissions ***/
user_pref("permissions.manager.defaultsUrl", "");
/* 2617: remove webchannel whitelist ***/
user_pref("webchannel.allowObject.urlWhitelist", "");
-/* 2619: enforce Punycode for Internationalized Domain Names to eliminate possible spoofing
- * Firefox has *some* protections, but it is better to be safe than sorry
+/* 2619: use Punycode in Internationalized Domain Names to eliminate possible spoofing
* [SETUP-WEB] Might be undesirable for non-latin alphabet users since legitimate IDN's are also punycoded
* [TEST] https://www.xn--80ak6aa92e.com/ (www.apple.com)
* [1] https://wiki.mozilla.org/IDN_Display_Algorithm
* [2] https://en.wikipedia.org/wiki/IDN_homograph_attack
- * [3] CVE-2017-5383: https://www.mozilla.org/security/advisories/mfsa2017-02/
+ * [3] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=punycode+firefox
* [4] https://www.xudongz.com/blog/2017/idn-phishing/ ***/
user_pref("network.IDN_show_punycode", true);
-/* 2620: enforce Firefox's built-in PDF reader [SETUP-CHROME]
+/* 2620: enforce PDFJS, disable PDFJS scripting [SETUP-CHROME]
* This setting controls if the option "Display in Firefox" is available in the setting below
* and by effect controls whether PDFs are handled in-browser or externally ("Ask" or "Open With")
- * PROS: pdfjs is lightweight, open source, and as secure/vetted as any pdf reader out there (more than most)
- * Exploits are rare (1 serious case in 4 yrs), treated seriously and patched quickly.
+ * PROS: pdfjs is lightweight, open source, and more secure/vetted than most
+ * Exploits are rare (one serious case in seven years), treated seriously and patched quickly.
* It doesn't break "state separation" of browser content (by not sharing with OS, independent apps).
* It maintains disk avoidance and application data isolation. It's convenient. You can still save to disk.
* CONS: You may prefer a different pdf reader for security reasons
- * CAVEAT: JS can still force a pdf to open in-browser by bundling its own code (rare)
+ * CAVEAT: JS can still force a pdf to open in-browser by bundling its own code
* [SETTING] General>Applications>Portable Document Format (PDF) ***/
user_pref("pdfjs.disabled", false); // [DEFAULT: false]
-/* 2621: disable links launching Windows Store on Windows 8/8.1/10 [WINDOWS]
- * [1] https://www.ghacks.net/2016/03/25/block-firefox-chrome-windows-store/ ***/
+user_pref("pdfjs.enableScripting", false); // [FF86+]
+/* 2621: disable links launching Windows Store on Windows 8/8.1/10 [WINDOWS] ***/
user_pref("network.protocol-handler.external.ms-windows-store", false);
-/* 2622: enforce no system colors; they can be fingerprinted
- * [SETTING] General>Language and Appearance>Fonts and Colors>Colors>Use system colors ***/
-user_pref("browser.display.use_system_colors", false); // [DEFAULT: false]
/* 2623: disable permissions delegation [FF73+]
* Currently applies to cross-origin geolocation, camera, mic and screen-sharing
* permissions, and fullscreen requests. Disabling delegation means any prompts
* for these will show/use their correct 3rd party origin
- * [1] https://groups.google.com/forum/#!topic/mozilla.dev.platform/BdFOMAuCGW8/discussion */
+ * [1] https://groups.google.com/forum/#!topic/mozilla.dev.platform/BdFOMAuCGW8/discussion ***/
user_pref("permissions.delegation.enabled", false);
-/* 2650: discourage downloading to desktop
- * 0=desktop, 1=downloads (default), 2=last used
- * [SETTING] To set your default "downloads": General>Downloads>Save files to ***/
- // user_pref("browser.download.folderList", 2);
-/* 2651: enforce user interaction for security by always asking where to download
+/* 2651: enable user interaction for security by always asking where to download
* [SETUP-CHROME] On Android this blocks longtapping and saving images
* [SETTING] General>Downloads>Always ask you where to save files ***/
user_pref("browser.download.useDownloadDir", false);
/* 2652: disable adding downloads to the system's "recent documents" list ***/
user_pref("browser.download.manager.addToRecentDocs", false);
-/* 2653: disable hiding mime types (Options>General>Applications) not associated with a plugin ***/
-user_pref("browser.download.hide_plugins_without_extensions", false);
-/* 2654: disable "open with" in download dialog [FF50+] [SETUP-HARDEN]
- * This is very useful to enable when the browser is sandboxed (e.g. via AppArmor)
- * in such a way that it is forbidden to run external applications.
- * [WARNING] This may interfere with some users' workflow or methods
- * [1] https://bugzilla.mozilla.org/1281959 ***/
- // user_pref("browser.download.forbid_open_with", true);
/* 2660: lock down allowed extension directories
* [SETUP-CHROME] This will break extensions, language packs, themes and any other
* XPI files which are installed outside of profile and application directories
* [1] https://mike.kaply.com/2012/02/21/understanding-add-on-scopes/
- * [1] archived: https://archive.is/DYjAM ***/
+ * [1] https://archive.is/DYjAM (archived) ***/
user_pref("extensions.enabledScopes", 5); // [HIDDEN PREF]
user_pref("extensions.autoDisableScopes", 15); // [DEFAULT: 15]
+/* 2661: disable bypassing 3rd party extension install prompts [FF82+]
+ * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1659530,1681331 ***/
+user_pref("extensions.postDownloadThirdPartyPrompt", false);
/* 2662: disable webextension restrictions on certain mozilla domains (you also need 4503) [FF60+]
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1384330,1406795,1415644,1453988 ***/
// user_pref("extensions.webextensions.restrictedDomains", "");
-/* 2680: enforce CSP (Content Security Policy)
- * [WARNING] CSP is a very important and widespread security feature. Don't disable it!
- * [1] https://developer.mozilla.org/docs/Web/HTTP/CSP ***/
-user_pref("security.csp.enable", true); // [DEFAULT: true]
-/* 2684: enforce a security delay on some confirmation dialogs such as install, open/save
- * [1] https://www.squarefree.com/2004/07/01/race-conditions-in-security-dialogs/ ***/
-user_pref("security.dialog_enable_delay", 700);
+/*** [SECTION 2700]: PERSISTENT STORAGE
+ Data SET by websites including
+ cookies : profile\cookies.sqlite
+ localStorage : profile\webappsstore.sqlite
+ indexedDB : profile\storage\default
-/*** [SECTION 2700]: PERSISTENT STORAGE
- Data SET by websites including
- cookies : profile\cookies.sqlite
- localStorage : profile\webappsstore.sqlite
- indexedDB : profile\storage\default
- appCache : profile\OfflineCache
- [NOTE] indexedDB and serviceWorkers are not available in Private Browsing Mode
- [NOTE] Blocking cookies also blocks websites access to: localStorage (incl. sessionStorage),
- indexedDB, sharedWorker, and serviceWorker (and therefore service worker cache and notifications)
- If you set a site exception for cookies (either "Allow" or "Allow for Session") then they become
- accessible to websites except shared/service workers where the cookie setting *must* be "Allow"
+ [NOTE] indexedDB and serviceWorkers are not available in Private Browsing Mode
+ [NOTE] Blocking cookies also blocks websites access to: localStorage (incl. sessionStorage),
+ indexedDB, sharedWorker, and serviceWorker (and therefore service worker cache and notifications)
+ If you set a site exception for cookies (either "Allow" or "Allow for Session") then they become
+ accessible to websites except shared/service workers where the cookie setting must be "Allow"
user_pref("_user.js.parrot", "2700 syntax error: the parrot's joined the bleedin' choir invisible!");
-/* 2701: disable 3rd-party cookies and site-data [SETUP-WEB]
- * 0=Accept cookies and site data, 1=(Block) All third-party cookies, 2=(Block) All cookies,
- * 3=(Block) Cookies from unvisited websites, 4=(Block) Cross-site and social media trackers (FF63+) (default FF69+)
- * [NOTE] You can set exceptions under site permissions or use an extension
+/* 2701: disable or isolate 3rd-party cookies and site-data [SETUP-WEB]
+ * 0 = Accept cookies and site data
+ * 1 = (Block) All third-party cookies
+ * 2 = (Block) All cookies
+ * 3 = (Block) Cookies from unvisited websites
+ * 4 = (Block) Cross-site tracking cookies (default)
+ * 5 = (Isolate All) Cross-site cookies (TCP: Total Cookie Protection / dFPI: dynamic FPI) [1] (FF86+)
+ * Option 5 with FPI enabled (4001) is ignored and not shown, and option 4 used instead
+ * [NOTE] You can set cookie exceptions under site permissions or use an extension
* [NOTE] Enforcing category to custom ensures ETP related prefs are always honored
- * [SETTING] Privacy & Security>Enhanced Tracking Protection>Custom>Cookies ***/
+ * [SETTING] Privacy & Security>Enhanced Tracking Protection>Custom>Cookies
+ * [1] https://blog.mozilla.org/security/2021/02/23/total-cookie-protection/ ***/
user_pref("network.cookie.cookieBehavior", 1);
//;user_pref("browser.contentblocking.category", "custom");
-/* 2702: set third-party cookies (i.e ALL) (if enabled, see 2701) to session-only
- and (FF58+) set third-party non-secure (i.e HTTP) cookies to session-only
- [NOTE] .sessionOnly overrides .nonsecureSessionOnly except when .sessionOnly=false and
- .nonsecureSessionOnly=true. This allows you to keep HTTPS cookies, but session-only HTTP ones
+/* 2702: set third-party cookies (if enabled, see 2701) to session-only
+ * [NOTE] .sessionOnly overrides .nonsecureSessionOnly except when .sessionOnly=false and
+ * .nonsecureSessionOnly=true. This allows you to keep HTTPS cookies, but session-only HTTP ones
* [1] https://feeding.cloud.geek.nz/posts/tweaking-cookies-for-privacy-in-firefox/ ***/
//;user_pref("network.cookie.thirdparty.sessionOnly", true);
//;user_pref("network.cookie.thirdparty.nonsecureSessionOnly", true); // [FF58+]
* [NOTE] The setting below is disabled (but not changed) if you block all cookies (2701 = 2)
* [SETTING] Privacy & Security>Cookies and Site Data>Delete cookies and site data when Firefox is closed ***/
// user_pref("network.cookie.lifetimePolicy", 2);
-/* 2710: disable DOM (Document Object Model) Storage
- * [WARNING] This will break a LOT of sites' functionality AND extensions!
- * You are better off using an extension for more granular control ***/
- // user_pref("dom.storage.enabled", false);
-/* 2730: disable offline cache ***/
-user_pref("browser.cache.offline.enable", false);
+/* 2710: enable Enhanced Tracking Protection (ETP) in all windows
+ * [SETTING] Privacy & Security>Enhanced Tracking Protection>Custom>Tracking content
+ * [SETTING] to add site exceptions: Urlbar>ETP Shield
+ * [SETTING] to manage site exceptions: Options>Privacy & Security>Enhanced Tracking Protection>Manage Exceptions ***/
+user_pref("privacy.trackingprotection.enabled", true);
+/* 2711: enable various ETP lists ***/
+user_pref("privacy.trackingprotection.socialtracking.enabled", true);
+ // user_pref("privacy.trackingprotection.cryptomining.enabled", true); // [DEFAULT: true]
+ // user_pref("privacy.trackingprotection.fingerprinting.enabled", true); // [DEFAULT: true]
/* 2740: disable service worker cache and cache storage
- * [NOTE] We clear service worker cache on exiting Firefox (see 2803)
+ * [NOTE] We clear service worker cache on exit (2803)
* [1] https://w3c.github.io/ServiceWorker/#privacy ***/
// user_pref("dom.caches.enabled", false);
/* 2750: disable Storage API [FF51+]
* [3] https://blog.mozilla.org/l10n/2017/03/07/firefox-l10n-report-aurora-54/ ***/
// user_pref("dom.storageManager.enabled", false);
/* 2755: disable Storage Access API [FF65+]
- * [1] https://developer.mozilla.org/en-US/docs/Web/API/Storage_Access_API ***/
+ * [1] https://developer.mozilla.org/docs/Web/API/Storage_Access_API ***/
// user_pref("dom.storage_access.enabled", false);
+/* 2760: enable Local Storage Next Generation (LSNG) [FF65+] ***/
+user_pref("dom.storage.next_gen", true); // [DEFAULT: true FF92+]
/*** [SECTION 2800]: SHUTDOWN
- You should set the values to what suits you best.
- - "Offline Website Data" includes appCache (2730), localStorage (2710),
- service worker cache (2740), and QuotaManager (IndexedDB (2720), asm-cache)
- - In both 2803 + 2804, the 'download' and 'history' prefs are combined in the
- Firefox interface as "Browsing & Download History" and their values will be synced
+ * Sanitizing on shutdown is all or nothing. It does not use Managed Exceptions under
+ Privacy & Security>Delete cookies and site data when Firefox is closed (1681701)
+ * If you want to keep some sites' cookies (exception as "Allow") and optionally other site
+ data but clear all the rest on close, then you need to set the "cookie" and optionally the
+ "offlineApps" prefs below to false, and to set the cookie lifetime pref to 2 (2703)
user_pref("_user.js.parrot", "2800 syntax error: the parrot's bleedin' demised!");
-/* 2802: enable Firefox to clear items on shutdown (see 2803)
+/* 2802: enable Firefox to clear items on shutdown (2803)
* [SETTING] Privacy & Security>History>Custom Settings>Clear history when Firefox closes ***/
//;user_pref("privacy.sanitize.sanitizeOnShutdown", true);
/* 2803: set what items to clear on shutdown (if 2802 is true) [SETUP-CHROME]
- * [NOTE] If 'history' is true, downloads will also be cleared regardless of the value
- * but if 'history' is false, downloads can still be cleared independently
- * However, this may not always be the case. The interface combines and syncs these
- * prefs when set from there, and the sanitize code may change at any time
- * [SETTING] Privacy & Security>History>Custom Settings>Clear history when Firefox closes>Settings ***/
+ * [NOTE] If "history" is true, downloads will also be cleared
+ * [NOTE] Active Logins: does not refer to logins via cookies, but rather HTTP Basic Authentication [1]
+ * [NOTE] Offline Website Data: localStorage, service worker cache, QuotaManager (IndexedDB, asm-cache)
+ * [SETTING] Privacy & Security>History>Custom Settings>Clear history when Firefox closes>Settings
+ * [1] https://en.wikipedia.org/wiki/Basic_access_authentication ***/
//;user_pref("privacy.clearOnShutdown.cache", true);
//;user_pref("privacy.clearOnShutdown.cookies", true);
//;user_pref("privacy.clearOnShutdown.downloads", true); // see note above
//;user_pref("privacy.clearOnShutdown.siteSettings", false); // Site Preferences
/* 2804: reset default items to clear with Ctrl-Shift-Del (to match 2803) [SETUP-CHROME]
* This dialog can also be accessed from the menu History>Clear Recent History
- * Firefox remembers your last choices. This will reset them when you start Firefox.
- * [NOTE] Regardless of what you set privacy.cpd.downloads to, as soon as the dialog
- * for "Clear Recent History" is opened, it is synced to the same as 'history' ***/
+ * Firefox remembers your last choices. This will reset them when you start Firefox
+ * [NOTE] Regardless of what you set "downloads" to, as soon as the dialog
+ * for "Clear Recent History" is opened, it is synced to the same as "history" ***/
//;user_pref("privacy.cpd.cache", true);
//;user_pref("privacy.cpd.cookies", true);
// user_pref("privacy.cpd.downloads", true); // not used, see note above
//;user_pref("privacy.cpd.sessions", true); // Active Logins
user_pref("privacy.cpd.siteSettings", false); // Site Preferences
/* 2805: clear Session Restore data when sanitizing on shutdown or manually [FF34+]
- * [NOTE] Not needed if Session Restore is not used (see 0102) or is already cleared with history (see 2803)
- * [NOTE] privacy.clearOnShutdown.openWindows prevents resuming from crashes (see 1022)
+ * [NOTE] Not needed if Session Restore is not used (0102) or is already cleared with history (2803)
+ * [NOTE] privacy.clearOnShutdown.openWindows prevents resuming from crashes (also see 5008)
* [NOTE] privacy.cpd.openWindows has a bug that causes an additional window to open ***/
// user_pref("privacy.clearOnShutdown.openWindows", true);
// user_pref("privacy.cpd.openWindows", true);
-/* 2806: reset default 'Time range to clear' for 'Clear Recent History' (see 2804)
- * Firefox remembers your last choice. This will reset the value when you start Firefox.
- * 0=everything, 1=last hour, 2=last two hours, 3=last four hours,
- * 4=today, 5=last five minutes, 6=last twenty-four hours
- * [NOTE] The values 5 + 6 are not listed in the dropdown, which will display a
- * blank value if they are used, but they do work as advertised ***/
+/* 2806: reset default "Time range to clear" for "Clear Recent History" (2804)
+ * Firefox remembers your last choice. This will reset the value when you start Firefox
+ * 0=everything, 1=last hour, 2=last two hours, 3=last four hours, 4=today
+ * [NOTE] Values 5 (last 5 minutes) and 6 (last 24 hours) are not listed in the dropdown,
+ * which will display a blank value, and are not guaranteed to work ***/
user_pref("privacy.sanitize.timeSpan", 0);
/*** [SECTION 4000]: FPI (FIRST PARTY ISOLATION)
- ** 1278037 - isolate indexedDB (FF51+)
- ** 1277803 - isolate favicons (FF52+)
- ** 1264562 - isolate OCSP cache (FF52+)
- ** 1268726 - isolate Shared Workers (FF52+)
- ** 1316283 - isolate SSL session cache (FF52+)
- ** 1317927 - isolate media cache (FF53+)
- ** 1323644 - isolate HSTS and HPKP (FF54+)
- ** 1334690 - isolate HTTP Alternative Services (FF54+)
- ** 1334693 - isolate SPDY/HTTP2 (FF55+)
- ** 1337893 - isolate DNS cache (FF55+)
- ** 1344170 - isolate blob: URI (FF55+)
- ** 1300671 - isolate data:, about: URLs (FF55+)
- ** 1473247 - isolate IP addresses (FF63+)
- ** 1492607 - isolate postMessage with targetOrigin "*" (requires 4002) (FF65+)
- ** 1542309 - isolate top-level domain URLs when host is in the public suffix list (FF68+)
- ** 1506693 - isolate pdfjs range-based requests (FF68+)
- ** 1330467 - isolate site permissions (FF69+)
- ** 1534339 - isolate IPv6 (FF73+)
+ 1278037 - indexedDB (FF51+)
+ 1277803 - favicons (FF52+)
+ 1264562 - OCSP cache (FF52+)
+ 1268726 - Shared Workers (FF52+)
+ 1316283 - SSL session cache (FF52+)
+ 1317927 - media cache (FF53+)
+ 1323644 - HSTS and HPKP (FF54+)
+ 1334690 - HTTP Alternative Services (FF54+)
+ 1334693 - SPDY/HTTP2 (FF55+)
+ 1337893 - DNS cache (FF55+)
+ 1344170 - blob: URI (FF55+)
+ 1300671 - data:, about: URLs (FF55+)
+ 1473247 - IP addresses (FF63+)
+ 1542309 - top-level domain URLs when host is in the public suffix list (FF68+)
+ 1506693 - pdfjs range-based requests (FF68+)
+ 1330467 - site permissions (FF69+)
+ 1721858 - WebSocket (FF92+)
user_pref("_user.js.parrot", "4000 syntax error: the parrot's pegged out");
/* 4001: enable First Party Isolation [FF51+]
- * [SETUP-WEB] May break cross-domain logins and site functionality until perfected
- * [1] https://bugzilla.mozilla.org/1260931 ***/
+ * [SETUP-WEB] Breaks some cross-origin logins
+ * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1260931,1299996 ***/
user_pref("privacy.firstparty.isolate", true);
/* 4002: enforce FPI restriction for window.opener [FF54+]
* [NOTE] Setting this to false may reduce the breakage in 4001
* FF65+ blocks postMessage with targetOrigin "*" if originAttributes don't match. But
- * to reduce breakage it ignores the 1st-party domain (FPD) originAttribute. (see [2],[3])
- * The 2nd pref removes that limitation and will only allow communication if FPDs also match.
+ * to reduce breakage it ignores the 1st-party domain (FPD) originAttribute [2][3]
+ * The 2nd pref removes that limitation and will only allow communication if FPDs also match
* [1] https://bugzilla.mozilla.org/1319773#c22
* [2] https://bugzilla.mozilla.org/1492607
- * [3] https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage ***/
+ * [3] https://developer.mozilla.org/docs/Web/API/Window/postMessage ***/
// user_pref("privacy.firstparty.isolate.restrict_opener_access", true); // [DEFAULT: true]
- // user_pref("privacy.firstparty.isolate.block_post_message", true); // [HIDDEN PREF ESR]
+ // user_pref("privacy.firstparty.isolate.block_post_message", true);
+/* 4003: enable scheme with FPI [FF78+]
+ * [NOTE] Experimental: existing data and site permissions are incompatible
+ * and some site exceptions may not work e.g. HTTPS-only mode (1244) ***/
+ // user_pref("privacy.firstparty.isolate.use_site", true);
/*** [SECTION 4500]: RFP (RESIST FINGERPRINTING)
- This master switch will be used for a wide range of items, many of which will
- **override** existing prefs from FF55+, often providing a **better** solution
+ RFP covers a wide range of ongoing fingerprinting solutions.
+ It is an all-or-nothing buy in: you cannot pick and choose what parts you want
- IMPORTANT: As existing prefs become redundant, and some of them WILL interfere
- with how RFP works, they will be moved to section 4600 and made inactive
+ [WARNING] DO NOT USE extensions to alter RFP protected metrics
- ** 418986 - limit window.screen & CSS media queries leaking identifiable info (FF41+)
- [NOTE] Info only: To set a size, open a XUL (chrome) page (such as about:config) which is at
- 100% zoom, hit Shift+F4 to open the scratchpad, type window.resizeTo(1366,768), hit Ctrl+R to run.
- Test your window size, do some math, resize to allow for all the non inner window elements
- [TEST] https://ghacksuserjs.github.io/TorZillaPrint/TorZillaPrint.html#screen
- ** 1281949 - spoof screen orientation (FF50+)
- ** 1281963 - hide the contents of navigator.plugins and navigator.mimeTypes (FF50+)
- FF53: Fixes GetSupportedNames in nsMimeTypeArray and nsPluginArray (1324044)
- ** 1330890 - spoof timezone as UTC 0 (FF55+)
- FF58: Date.toLocaleFormat deprecated (818634)
- FF60: Date.toLocaleDateString and Intl.DateTimeFormat fixed (1409973)
- ** 1360039 - spoof navigator.hardwareConcurrency as 2 (see 4601) (FF55+)
- This spoof *shouldn't* affect core chrome/Firefox performance
- ** 1217238 - reduce precision of time exposed by javascript (FF55+)
- ** 1369303 - spoof/disable performance API (see 2410-deprecated, 4602, 4603) (FF56+)
- ** 1333651 & 1383495 & 1396468 - spoof User Agent & Navigator API (see section 4700) (FF56+)
- FF56: Version: rounded down to the nearest multiple of 10
- FF57: Version: match current ESR (1393283, 1418672, 1418162, 1511763)
- FF59: OS: Windows, OSX, Android, or Linux (to reduce breakage) (1404608)
- FF66: OS: HTTP Headers reduced to Windows or Android (1509829)
- FF68: OS: updated to Windows 10, OS 10.14, and Android 8.1 (1511434)
- FF78: OS: updated to OS 10.15 and Android 9.0 (1635011)
- ** 1369319 - disable device sensor API (see 4604) (FF56+)
- ** 1369357 - disable site specific zoom (see 4605) (FF56+)
- ** 1337161 - hide gamepads from content (see 4606) (FF56+)
- ** 1372072 - spoof network information API as "unknown" when dom.netinfo.enabled = true (see 4607) (FF56+)
- ** 1333641 - reduce fingerprinting in WebSpeech API (see 4608) (FF56+)
- ** 1372069 & 1403813 & 1441295 - block geolocation requests (same as denying a site permission) (see 0201, 0202) (FF56-62)
- ** 1369309 - spoof media statistics (see 4610) (FF57+)
- ** 1382499 - reduce screen co-ordinate fingerprinting in Touch API (see 4611) (FF57+)
- ** 1217290 & 1409677 - enable fingerprinting resistance for WebGL (see 2010-12) (FF57+)
- ** 1382545 - reduce fingerprinting in Animation API (FF57+)
- ** 1354633 - limit MediaError.message to a whitelist (FF57+)
- ** 1382533 - enable fingerprinting resistance for Presentation API (FF57+)
- This blocks exposure of local IP Addresses via mDNS (Multicast DNS)
- ** 967895 - spoof canvas and enable site permission prompt before allowing canvas data extraction (FF58+)
- FF59: Added to site permissions panel (1413780) Only prompt when triggered by user input (1376865)
- ** 1372073 - spoof/block fingerprinting in MediaDevices API (FF59+)
- Spoof: enumerate devices reports one "Internal Camera" and one "Internal Microphone" if
- media.navigator.enabled is true (see 2505 which we chose to keep disabled)
- Block: suppresses the ondevicechange event (see 4612)
- ** 1039069 - warn when language prefs are set to non en-US (see 0210, 0211) (FF59+)
- ** 1222285 & 1433592 - spoof keyboard events and suppress keyboard modifier events (FF59+)
+ 418986 - limit window.screen & CSS media queries (FF41)
+ [TEST] https://arkenfox.github.io/TZP/tzp.html#screen
+ 1281949 - spoof screen orientation (FF50)
+ 1281963 - hide contents of navigator.plugins and navigator.mimeTypes (FF50-88)
+ 1330890 - spoof timezone as UTC0 (FF55)
+ 1360039 - spoof navigator.hardwareConcurrency as 2 (FF55)
+ 1217238 - reduce precision of time exposed by javascript (FF55)
+ 1369303 - spoof/disable performance API
+ 1333651 - spoof User Agent & Navigator API
+ JS: FF91+ the version is spoofed as ESR, and the OS as Windows 10, OS 10.15, Android 10, or Linux
+ HTTP Headers: spoofed as Windows or Android
+ 1369319 - disable device sensor API
+ 1369357 - disable site specific zoom
+ 1337161 - hide gamepads from content
+ 1372072 - spoof network information API as "unknown" when dom.netinfo.enabled = true
+ 1333641 - reduce fingerprinting in WebSpeech API
+ 1369309 - spoof media statistics
+ 1382499 - reduce screen co-ordinate fingerprinting in Touch API
+ 1217290 & 1409677 - enable some fingerprinting resistance for WebGL
+ 1382545 - reduce fingerprinting in Animation API
+ 1354633 - limit MediaError.message to a whitelist
+ 1382533 & 1697680 - enable fingerprinting resistance for Presentation API (FF57-87)
+ Blocks exposure of local IP Addresses via mDNS (Multicast DNS)
+ 967895 - spoof canvas and enable site permission prompt (FF58)
+ 1372073 - spoof/block fingerprinting in MediaDevices API (FF59)
+ Spoof: enumerate devices as one "Internal Camera" and one "Internal Microphone"
+ Block: suppresses the ondevicechange event
+ 1039069 - warn when language prefs are not set to "en*" (also see 0210, 0211) (FF59)
+ 1222285 & 1433592 - spoof keyboard events and suppress keyboard modifier events (FF59)
Spoofing mimics the content language of the document. Currently it only supports en-US.
Modifier events suppressed are SHIFT and both ALT keys. Chrome is not affected.
- FF60: Fix keydown/keyup events (1438795)
- ** 1337157 - disable WebGL debug renderer info (see 4613) (FF60+)
- ** 1459089 - disable OS locale in HTTP Accept-Language headers (ANDROID) (FF62+)
- ** 1479239 - return "no-preference" with prefers-reduced-motion (see 4617) (FF63+)
- ** 1363508 - spoof/suppress Pointer Events (see 4614) (FF64+)
- FF65: pointerEvent.pointerid (1492766)
- ** 1485266 - disable exposure of system colors to CSS or canvas (see 4615) (FF67+)
- ** 1407366 - enable inner window letterboxing (see 4504) (FF67+)
- ** 1494034 - return "light" with prefers-color-scheme (see 4616) (FF67+)
- [1] https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme
- ** 1564422 - spoof audioContext outputLatency (FF70+)
- ** 1595823 - spoof audioContext sampleRate (FF72+)
- ** 1607316 - spoof pointer as coarse and hover as none (ANDROID) (FF74+)
- ** 1621433 - randomize canvas (previously FF58+ returned an all-white canvas) (FF78+)
+ 1337157 - disable WebGL debug renderer info (FF60)
+ 1459089 - disable OS locale in HTTP Accept-Language headers (ANDROID) (FF62)
+ 1479239 - return "no-preference" with prefers-reduced-motion (FF63)
+ 1363508 - spoof/suppress Pointer Events (FF64)
+ 1492766 - spoof pointerEvent.pointerid (FF65)
+ 1485266 - disable exposure of system colors to CSS or canvas (FF67)
+ 1494034 - return "light" with prefers-color-scheme (FF67)
+ 1564422 - spoof audioContext outputLatency (FF70)
+ 1595823 - return audioContext sampleRate as 44100 (FF72)
+ 1607316 - spoof pointer as coarse and hover as none (ANDROID) (FF74)
+ 1621433 - randomize canvas (previously FF58+ returned an all-white canvas) (FF78)
+ 1653987 - limit font visibility to bundled and "Base Fonts" (Windows, Mac, some Linux) (FF80)
+ 1461454 - spoof smooth=true and powerEfficient=false for supported media in MediaCapabilities (FF82)
+ 531915 - use fdlibm's sin, cos and tan in jsmath (FF93, ESR91.1)
user_pref("_user.js.parrot", "4500 syntax error: the parrot's popped 'is clogs");
/* 4501: enable privacy.resistFingerprinting [FF41+]
- * This pref is the master switch for all other privacy.resist* prefs unless stated
- * [SETUP-WEB] RFP can cause the odd website to break in strange ways, and has a few side affects,
- * but is largely robust nowadays. Give it a try. Your choice. Also see 4504 (letterboxing).
+ * [SETUP-WEB] RFP can cause some website breakage: mainly canvas, use a site exception via the urlbar
+ * RFP also has a few side effects: mainly timezone is UTC0, and websites will prefer light theme
* [1] https://bugzilla.mozilla.org/418986 ***/
user_pref("privacy.resistFingerprinting", true);
/* 4502: set new window sizes to round to hundreds [FF55+] [SETUP-CHROME]
* Width will round down to multiples of 200s and height to 100s, to fit your screen.
- * The override values are a starting point to round from if you want some control
- * [1] https://bugzilla.mozilla.org/1330882
- * [2] https://hardware.metrics.mozilla.com/ ***/
+ * The max values are a starting point to round from if you want some control
+ * [1] https://bugzilla.mozilla.org/1330882 ***/
// user_pref("privacy.window.maxInnerWidth", 1000);
// user_pref("privacy.window.maxInnerHeight", 1000);
/* 4503: disable mozAddonManager Web API [FF57+]
- * [NOTE] As a side-effect in FF57-59 this allowed extensions to work on AMO. In FF60+ you also need
- * to sanitize or clear extensions.webextensions.restrictedDomains (see 2662) to keep that side-effect
+ * [NOTE] To allow extensions to work on AMO, you also need 2662
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1384330,1406795,1415644,1453988 ***/
user_pref("privacy.resistFingerprinting.block_mozAddonManager", true); // [HIDDEN PREF]
/* 4504: enable RFP letterboxing [FF67+]
- * Dynamically resizes the inner window (FF67; 200w x100h: FF68+; stepped ranges) by applying letterboxing,
- * using dimensions which waste the least content area, If you use the dimension pref, then it will only apply
- * those resolutions. The format is "width1xheight1, width2xheight2, ..." (e.g. "800x600, 1000x1000, 1600x900")
- * [SETUP-WEB] This does NOT require RFP (see 4501) **for now**, so if you're not using 4501, or you are but you're
- * not taking anti-fingerprinting seriously and a little visual change upsets you, then feel free to flip this pref
- * [WARNING] The dimension pref is only meant for testing, and we recommend you DO NOT USE it
- * [1] https://bugzilla.mozilla.org/1407366 ***/
+ * Dynamically resizes the inner window by applying margins in stepped ranges [2]
+ * If you use the dimension pref, then it will only apply those resolutions.
+ * The format is "width1xheight1, width2xheight2, ..." (e.g. "800x600, 1000x1000")
+ * [SETUP-WEB] This is independent of RFP (4501). If you're not using RFP, or you are but
+ * dislike the margins, then flip this pref, keeping in mind that it is effectively fingerprintable
+ * [WARNING] DO NOT USE: the dimension pref is only meant for testing
+ * [1] https://bugzilla.mozilla.org/1407366
+ * [2] https://hg.mozilla.org/mozilla-central/rev/6d2d7856e468#l2.32 ***/
//;user_pref("privacy.resistFingerprinting.letterboxing", true); // [HIDDEN PREF]
// user_pref("privacy.resistFingerprinting.letterboxing.dimensions", ""); // [HIDDEN PREF]
-/* 4510: disable showing about:blank as soon as possible during startup [FF60+]
- * When default true (FF62+) this no longer masks the RFP chrome resizing activity
+/* 4505: experimental RFP [FF91+]
+ * [WARNING] DO NOT USE unless testing, see [1] comment 12
+ * [1] https://bugzilla.mozilla.org/1635603 ***/
+ // user_pref("privacy.resistFingerprinting.exemptedDomains", "*.example.invalid");
+ // user_pref("privacy.resistFingerprinting.testGranularityMask", 0);
+/* 4506: disable showing about:blank as soon as possible during startup [FF60+]
+ * When default true this no longer masks the RFP chrome resizing activity
* [1] https://bugzilla.mozilla.org/1448423 ***/
user_pref("browser.startup.blankWindow", false);
-/* 4520: disable chrome animations [FF77+] [RESTART]
- * [NOTE] pref added in FF63, but applied to chrome in FF77. RFP spoofs this for web content ***/
-user_pref("ui.prefersReducedMotion", 1); // [HIDDEN PREF]
+/* 4510: enforce no system colors
+ * [SETTING] General>Language and Appearance>Fonts and Colors>Colors>Use system colors ***/
+user_pref("browser.display.use_system_colors", false); // [DEFAULT: false]
+/* 4511: enforce non-native widget theme
+ * Security: removes/reduces system API calls, e.g. win32k API [1]
+ * Fingerprinting: provides a uniform look and feel across platforms [2]
+ * [1] https://bugzilla.mozilla.org/1381938
+ * [2] https://bugzilla.mozilla.org/1411425 ***/
+user_pref("widget.non-native-theme.enabled", true); // [DEFAULT: true]
+/* 4512: enforce links targeting new windows to open in a new tab instead
+ * 1=most recent window or tab, 2=new window, 3=new tab
+ * Stops malicious window sizes and some screen resolution leaks.
+ * You can still right-click a link and open in a new window
+ * [SETTING] General>Tabs>Open links in tabs instead of new windows
+ * [TEST] https://arkenfox.github.io/TZP/tzp.html#screen
+ * [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/9881 ***/
+user_pref("browser.link.open_newwindow", 3); // [DEFAULT: 3]
+/* 4513: set all open window methods to abide by "browser.link.open_newwindow" (4512)
+ * [1] https://searchfox.org/mozilla-central/source/dom/tests/browser/browser_test_new_window_from_content.js ***/
+user_pref("browser.link.open_newwindow.restriction", 0);
+/* 4520: disable WebGL (Web Graphics Library)
+ * [SETUP-WEB] If you need it then enable it. RFP still randomizes canvas for naive scripts ***/
+user_pref("webgl.disabled", true);
-/*** [SECTION 4600]: RFP ALTERNATIVES
- Enable the whole section (see the SETUP tag below)
- Make sure these are reset in about:config. They are redundant. In fact, some
- even cause RFP to not behave as you would expect and alter your fingerprint
- Reset those *up to and including* your version. Add those *after* your version
- as active prefs in your overrides. This is assuming that the patch wasn't also
- backported to Firefox ESR. Backporting RFP patches to ESR is rare.
+/*** [SECTION 5000]: OPTIONAL OPSEC
+ Disk avoidance, application data isolation, eyeballs...
+user_pref("_user.js.parrot", "5000 syntax error: the parrot's taken 'is last bow");
+/* 5001: start Firefox in PB (Private Browsing) mode
+ * [NOTE] In this mode all windows are "private windows" and the PB mode icon is not displayed
+ * [NOTE] The P in PB mode can be misleading: it means no "persistent" disk state such as history,
+ * caches, searches, cookies, localStorage, IndexedDB etc (which you can achieve in normal mode).
+ * In fact, PB mode limits or removes the ability to control some of these, and you need to quit
+ * Firefox to clear them. PB is best used as a one off window (Menu>New Private Window) to provide
+ * a temporary self-contained new session. Close all Private Windows to clear the PB mode session.
+ * [SETTING] Privacy & Security>History>Custom Settings>Always use private browsing mode
+ * [1] https://wiki.mozilla.org/Private_Browsing
+ * [2] https://support.mozilla.org/kb/common-myths-about-private-browsing ***/
+ // user_pref("browser.privatebrowsing.autostart", true);
+/* 5002: disable memory cache
+ * capacity: -1=determine dynamically (default), 0=none, n=memory capacity in kibibytes ***/
+ // user_pref("browser.cache.memory.enable", false);
+ // user_pref("browser.cache.memory.capacity", 0);
+/* 5003: disable saving passwords
+ * [NOTE] This does not clear any passwords already saved
+ * [SETTING] Privacy & Security>Logins and Passwords>Ask to save logins and passwords for websites ***/
+ // user_pref("signon.rememberSignons", false);
+/* 5004: disable permissions manager from writing to disk [FF41+] [RESTART]
+ * [NOTE] This means any permission changes are session only
+ * [1] https://bugzilla.mozilla.org/967812 ***/
+ // user_pref("permissions.memory_only", true); // [HIDDEN PREF]
+/* 5005: disable intermediate certificate caching [FF41+] [RESTART]
+ * [NOTE] This affects login/cert/key dbs. The effect is all credentials are session-only.
+ * Saved logins and passwords are not available. Reset the pref and restart to return them ***/
+ // user_pref("security.nocertdb", true); // [HIDDEN PREF]
+/* 5006: disable favicons in history and bookmarks
+ * [NOTE] Stored as data blobs in favicons.sqlite, these don't reveal anything that your
+ * actual history (and bookmarks) already do. Your history is more detailed, so
+ * control that instead; e.g. disable history, clear history on close, use PB mode
+ * [NOTE] favicons.sqlite is sanitized on Firefox close ***/
+ // user_pref("browser.chrome.site_icons", false);
+/* 5007: exclude "Undo Closed Tabs" in Session Restore ***/
+ // user_pref("browser.sessionstore.max_tabs_undo", 0);
+/* 5008: disable resuming session from crash ***/
+ // user_pref("browser.sessionstore.resume_from_crash", false);
+/* 5009: disable "open with" in download dialog [FF50+]
+ * Application data isolation [1]
+ * [1] https://bugzilla.mozilla.org/1281959 ***/
+ // user_pref("browser.download.forbid_open_with", true);
+/* 5010: disable location bar suggestion types
+ * [SETTING] Privacy & Security>Address Bar>When using the address bar, suggest ***/
+ // user_pref("browser.urlbar.suggest.history", false);
+ // user_pref("browser.urlbar.suggest.bookmark", false);
+ // user_pref("browser.urlbar.suggest.openpage", false);
+ // user_pref("browser.urlbar.suggest.topsites", false); // [FF78+]
+/* 5011: disable location bar dropdown
+ * This value controls the total number of entries to appear in the location bar dropdown ***/
+ // user_pref("browser.urlbar.maxRichResults", 0);
+/* 5012: disable location bar autofill
+ * [1] https://support.mozilla.org/kb/address-bar-autocomplete-firefox#w_url-autocomplete ***/
+ // user_pref("browser.urlbar.autoFill", false);
+/* 5013: disable browsing and download history
+ * [NOTE] We also clear history and downloads on exit (2803)
+ * [SETTING] Privacy & Security>History>Custom Settings>Remember browsing and download history ***/
+ // user_pref("places.history.enabled", false);
+/* 5014: disable Windows jumplist [WINDOWS] ***/
+ // user_pref("browser.taskbar.lists.enabled", false);
+ // user_pref("browser.taskbar.lists.frequent.enabled", false);
+ // user_pref("browser.taskbar.lists.recent.enabled", false);
+ // user_pref("browser.taskbar.lists.tasks.enabled", false);
+/* 5015: disable Windows taskbar preview [WINDOWS] ***/
+ // user_pref("browser.taskbar.previews.enable", false); // [DEFAULT: false]
+/* 5016: discourage downloading to desktop
+ * 0=desktop, 1=downloads (default), 2=last used
+ * [SETTING] To set your default "downloads": General>Downloads>Save files to ***/
+ // user_pref("browser.download.folderList", 2);
+/*** [SECTION 5500]: OPTIONAL HARDENING
+ Not recommended. Keep in mind that these can cause breakage and performance
+ issues, are mostly fingerpintable, and the threat model is practically zero
-user_pref("_user.js.parrot", "4600 syntax error: the parrot's crossed the Jordan");
-/* [SETUP-non-RFP] Non-RFP users replace the * with a slash on this line to enable these
-// 4601: [2514] spoof (or limit?) number of CPU cores [FF48+]
- // [NOTE] *may* affect core chrome/Firefox performance, will affect content.
- // [1] https://bugzilla.mozilla.org/1008453
- // [2] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/21675
- // [3] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/22127
- // [4] https://html.spec.whatwg.org/multipage/workers.html#navigator.hardwareconcurrency
- // user_pref("dom.maxHardwareConcurrency", 2);
-// 4602: [2411] disable resource/navigation timing
-user_pref("dom.enable_resource_timing", false);
-// 4603: [2412] disable timing attacks
- // [1] https://wiki.mozilla.org/Security/Reviews/Firefox/NavigationTimingAPI
-user_pref("dom.enable_performance", false);
-// 4604: [2512] disable device sensor API
- // Optional protection depending on your device
- // [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/15758
- // [2] https://blog.lukaszolejnik.com/stealing-sensitive-browser-data-with-the-w3c-ambient-light-sensor-api/
- // [3] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1357733,1292751
+user_pref("_user.js.parrot", "5500 syntax error: this is an ex-parrot!");
+/* 5501: disable MathML (Mathematical Markup Language) [FF51+]
+ * [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=mathml ***/
+ // user_pref("mathml.disabled", true); // 1173199
+/* 5502: disable in-content SVG (Scalable Vector Graphics) [FF53+]
+ * [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=firefox+svg ***/
+ // user_pref("svg.disabled", true); // 1216893
+/* 5503: disable graphite
+ * [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=firefox+graphite
+ * [2] https://en.wikipedia.org/wiki/Graphite_(SIL) ***/
+ // user_pref("gfx.font_rendering.graphite.enabled", false);
+/* 5504: disable asm.js [FF22+]
+ * [1] http://asmjs.org/
+ * [2] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=asm.js
+ * [3] https://rh0dev.github.io/blog/2017/the-return-of-the-jit/ ***/
+ // user_pref("javascript.options.asmjs", false);
+/* 5505: disable Ion and baseline JIT to harden against JS exploits
+ * [NOTE] In FF75+, when **both** Ion and JIT are disabled, **and** the new
+ * hidden pref is enabled, then Ion can still be used by extensions (1599226)
+ * [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=firefox+jit ***/
+ // user_pref("javascript.options.ion", false);
+ // user_pref("javascript.options.baselinejit", false);
+ // user_pref("javascript.options.jit_trustedprincipals", true); // [FF75+] [HIDDEN PREF]
+/* 5506: disable WebAssembly [FF52+]
+ * Vulnerabilities [1] have increasingly been found, including those known and fixed
+ * in native programs years ago [2]. WASM has powerful low-level access, making
+ * certain attacks (brute-force) and vulnerabilities more possible
+ * [STATS] ~0.2% of websites, about half of which are for crytopmining / malvertising [2][3]
+ * [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=wasm
+ * [2] https://spectrum.ieee.org/tech-talk/telecom/security/more-worries-over-the-security-of-web-assembly
+ * [3] https://www.zdnet.com/article/half-of-the-websites-using-webassembly-use-it-for-malicious-purposes ***/
+ // user_pref("javascript.options.wasm", false);
+/*** [SECTION 6000]: DON'T TOUCH ***/
+user_pref("_user.js.parrot", "6000 syntax error: the parrot's 'istory!");
+/* 6001: enforce Firefox blocklist
+ * [WHY] It includes updates for "revoked certificates"
+ * [1] https://blog.mozilla.org/security/2015/03/03/revoking-intermediate-certificates-introducing-onecrl/ ***/
+user_pref("extensions.blocklist.enabled", true); // [DEFAULT: true]
+/* 6002: enforce no referer spoofing
+ * [WHY] Spoofing can affect CSRF (Cross-Site Request Forgery) protections ***/
+user_pref("network.http.referer.spoofSource", false); // [DEFAULT: false]
+/* 6003: enforce CSP (Content Security Policy)
+ * [1] https://developer.mozilla.org/docs/Web/HTTP/CSP ***/
+user_pref("security.csp.enable", true); // [DEFAULT: true]
+/* 6004: enforce a security delay on some confirmation dialogs such as install, open/save
+ * [1] https://www.squarefree.com/2004/07/01/race-conditions-in-security-dialogs/ ***/
+user_pref("security.dialog_enable_delay", 1000); // [DEFAULT: 1000]
+/* 6005: enforce window.opener protection [FF65+]
+ * Makes rel=noopener implicit for target=_blank in anchor and area elements when no rel attribute is set ***/
+user_pref("dom.targetBlankNoOpener.enabled", true); // [DEFAULT: true FF79+]
+/* 6006: enforce "window.name" protection [FF82+]
+ * If a new page from another domain is loaded into a tab, then window.name is set to an empty string. The original
+ * string is restored if the tab reverts back to the original page. This change prevents some cross-site attacks
+ * [TEST] https://arkenfox.github.io/TZP/tests/windownamea.html ***/
+user_pref("privacy.window.name.update.enabled", true); // [DEFAULT: true FF86+]
+/* 6050: prefsCleaner: reset previously active items removed from arkenfox in 79-91 ***/
+ // user_pref("browser.newtabpage.activity-stream.asrouter.providers.snippets", "");
+ // user_pref("browser.send_pings.require_same_host", "");
+ // user_pref("dom.allow_cut_copy", "");
+ // user_pref("dom.vibrator.enabled", "");
+ // user_pref("media.getusermedia.audiocapture.enabled", "");
+ // user_pref("media.getusermedia.browser.enabled", "");
+ // user_pref("media.getusermedia.screensharing.enabled", "");
+ // user_pref("media.gmp-widevinecdm.visible", "");
+ // user_pref("network.http.redirection-limit", "");
+ // user_pref("privacy.partition.network_state", "");
+ // user_pref("security.insecure_connection_icon.enabled", ""); // [DEFAULT: true FF70+]
+ // user_pref("security.mixed_content.block_active_content", ""); // [DEFAULT: true since at least FF60]
+ // user_pref("security.ssl.enable_ocsp_stapling", ""); // [DEFAULT: true FF26+]
+ // user_pref("webgl.disable-fail-if-major-performance-caveat", ""); // [DEFAULT: true FF86+]
+ // user_pref("webgl.enable-webgl2", "");
+ // user_pref("webgl.min_capability_mode", "");
+/*** [SECTION 7000]: DON'T BOTHER ***/
+user_pref("_user.js.parrot", "7000 syntax error: the parrot's pushing up daisies!");
+ * Location-Aware Browsing, Full Screen, offline cache (appCache), Virtual Reality
+ * [WHY] The API state is easily fingerprintable. Geo and VR are behind prompts (7002).
+ * appCache storage capability was removed in FF90. Full screen requires user interaction ***/
+ // user_pref("geo.enabled", false);
+ // user_pref("full-screen-api.enabled", false);
+ // user_pref("browser.cache.offline.enable", false);
+ // user_pref("dom.vr.enabled", false);
+/* 7002: set default permissions
+ * Location, Camera, Microphone, Notifications [FF58+] Virtual Reality [FF73+]
+ * 0=always ask (default), 1=allow, 2=block
+ * [WHY] These are fingerprintable via Permissions API, except VR. Just add site
+ * exceptions as allow/block for frequently visited/annoying sites: i.e. not global
+ * [SETTING] to add site exceptions: Ctrl+I>Permissions>
+ * [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Settings ***/
+ // user_pref("permissions.default.geo", 0);
+ // user_pref("permissions.default.camera", 0);
+ // user_pref("permissions.default.microphone", 0);
+ // user_pref("permissions.default.desktop-notification", 0);
+ // user_pref("permissions.default.xr", 0); // Virtual Reality
+/* 7003: disable non-modern cipher suites [1]
+ * [WHY] Passive fingerprinting. Minimal/non-existent threat of downgrade attacks
+ * [1] https://browserleaks.com/ssl ***/
+ // user_pref("security.ssl3.ecdhe_ecdsa_aes_256_sha", false);
+ // user_pref("security.ssl3.ecdhe_ecdsa_aes_128_sha", false);
+ // user_pref("security.ssl3.ecdhe_rsa_aes_128_sha", false);
+ // user_pref("security.ssl3.ecdhe_rsa_aes_256_sha", false);
+ // user_pref("security.ssl3.rsa_aes_128_gcm_sha256", false); // no PFS
+ // user_pref("security.ssl3.rsa_aes_256_gcm_sha384", false); // no PFS
+ // user_pref("security.ssl3.rsa_aes_128_sha", false); // no PFS
+ // user_pref("security.ssl3.rsa_aes_256_sha", false); // no PFS
+ // user_pref("security.ssl3.rsa_des_ede3_sha", false); // 3DES
+/* 7004: control TLS versions
+ * [WHY] Passive fingerprinting. Downgrades are still possible: behind user interaction ***/
+ // user_pref("security.tls.version.min", 3); // [DEFAULT: 3]
+ // user_pref("security.tls.version.max", 4);
+/* 7005: disable SSL session IDs [FF36+]
+ * [WHY] Passive fingerprinting and perf costs. These are session-only and isolated
+ * with network partitioning (FF85+) or when using FPI and/or containers ***/
+ // user_pref("security.ssl.disable_session_identifiers", true); // [HIDDEN PREF]
+ * [WHY] Firefox doesn't support hidden services. Use Tor Browser ***/
+ // user_pref("dom.securecontext.whitelist_onions", true); // 1382359
+ // user_pref("network.http.referer.hideOnionSource", true); // 1305144
+ * [WHY] Only cross-origin referers (1600s) need control ***/
+ // user_pref("network.http.sendRefererHeader", 2);
+ // user_pref("network.http.referer.trimmingPolicy", 0);
+/* 7008: set the default Referrer Policy [FF59+]
+ * 0=no-referer, 1=same-origin, 2=strict-origin-when-cross-origin, 3=no-referrer-when-downgrade
+ * [WHY] Defaults are fine. They can be overridden by a site-controlled Referrer Policy ***/
+ // user_pref("network.http.referer.defaultPolicy", 2); // [DEFAULT: 2 FF87+]
+ // user_pref("network.http.referer.defaultPolicy.pbmode", 2); // [DEFAULT: 2]
+ * [WHY] Passive fingerprinting. ~50% of sites use HTTP2 [1]
+ * [1] https://w3techs.com/technologies/details/ce-http2/all/all ***/
+ // user_pref("network.http.spdy.enabled", false);
+ // user_pref("network.http.spdy.enabled.deps", false);
+ // user_pref("network.http.spdy.enabled.http2", false);
+ // user_pref("network.http.spdy.websockets", false); // [FF65+]
+/* 7010: disable HTTP Alternative Services [FF37+]
+ * [WHY] Already isolated by network partitioning (FF85+) or FPI ***/
+ // user_pref("network.http.altsvc.enabled", false);
+ // user_pref("network.http.altsvc.oe", false);
+/* 7011: disable website control over browser right-click context menu
+ * [WHY] Just use Shift-Right-Click ***/
+ // user_pref("dom.event.contextmenu.enabled", false);
+/* 7012: disable icon fonts (glyphs) and local fallback rendering
+ * [WHY] Breakage, font fallback is equivalency, also RFP
+ * [1] https://bugzilla.mozilla.org/789788
+ * [2] https://gitlab.torproject.org/legacy/trac/-/issues/8455 ***/
+ // user_pref("gfx.downloadable_fonts.enabled", false); // [FF41+]
+ // user_pref("gfx.downloadable_fonts.fallback_delay", -1);
+/* 7013: disable Clipboard API
+ * [WHY] Fingerprintable. Breakage. Cut/copy/paste require user
+ * interaction, and paste is limited to focused editable fields ***/
+ // user_pref("dom.event.clipboardevents.enabled", false);
+/* 7014: disable System Add-on updates
+ * [WHY] It can compromise security. System addons ship with prefs, use those ***/
+ // user_pref("extensions.systemAddon.update.enabled", false); // [FF62+]
+ // user_pref("extensions.systemAddon.update.url", ""); // [FF44+]
+/*** [SECTION 8000]: DON'T BOTHER: NON-RFP
+ [WHY] They are insufficient to help anti-fingerprinting and do more harm than good
+ [WARNING] DO NOT USE with RFP. RFP already covers these and they can interfere
+user_pref("_user.js.parrot", "8000 syntax error: the parrot's crossed the Jordan");
+/* 8001: disable APIs ***/
// user_pref("device.sensors.enabled", false);
-// 4605: [2515] disable site specific zoom
- // Zoom levels affect screen res and are highly fingerprintable. This does not stop you using
- // zoom, it will just not use/remember any site specific settings. Zoom levels on new tabs
- // and new windows are reset to default and only the current tab retains the current zoom
-user_pref("browser.zoom.siteSpecific", false);
-// 4606: [2501] disable gamepad API - USB device ID enumeration
- // Optional protection depending on your connected devices
- // [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/13023
+ // user_pref("dom.enable_performance", false);
+ // user_pref("dom.enable_resource_timing", false);
// user_pref("dom.gamepad.enabled", false);
-// 4607: [2503] disable giving away network info [FF31+]
- // e.g. bluetooth, cellular, ethernet, wifi, wimax, other, mixed, unknown, none
- // [1] https://developer.mozilla.org/docs/Web/API/Network_Information_API
- // [2] https://wicg.github.io/netinfo/
- // [3] https://bugzilla.mozilla.org/960426
-user_pref("dom.netinfo.enabled", false); // [DEFAULT: true on Android]
-// 4608: [2021] disable the SpeechSynthesis (Text-to-Speech) part of the Web Speech API
- // [1] https://developer.mozilla.org/docs/Web/API/Web_Speech_API
- // [2] https://developer.mozilla.org/docs/Web/API/SpeechSynthesis
- // [3] https://wiki.mozilla.org/HTML5_Speech_API
-user_pref("media.webspeech.synth.enabled", false);
-// 4610: [2506] disable video statistics - JS performance fingerprinting [FF25+]
- // [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/15757
- // [2] https://bugzilla.mozilla.org/654550
-user_pref("media.video_stats.enabled", false);
-// 4611: [2509] disable touch events
- // fingerprinting attack vector - leaks screen res & actual screen coordinates
- // 0=disabled, 1=enabled, 2=autodetect
- // Optional protection depending on your device
- // [1] https://developer.mozilla.org/docs/Web/API/Touch_events
- // [2] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/10286
+ // user_pref("dom.netinfo.enabled", false);
+ // user_pref("dom.webaudio.enabled", false);
+/* 8002: disable other ***/
+ // user_pref("browser.display.use_document_fonts", 0);
+ // user_pref("browser.zoom.siteSpecific", false);
// user_pref("dom.w3c_touch_events.enabled", 0);
-// 4612: [2511] disable MediaDevices change detection [FF51+]
- // [1] https://developer.mozilla.org/docs/Web/Events/devicechange
- // [2] https://developer.mozilla.org/docs/Web/API/MediaDevices/ondevicechange
-user_pref("media.ondevicechange.enabled", false);
-// 4613: [2011] disable WebGL debug info being available to websites
- // [1] https://bugzilla.mozilla.org/1171228
- // [2] https://developer.mozilla.org/docs/Web/API/WEBGL_debug_renderer_info
-user_pref("webgl.enable-debug-renderer-info", false);
-// 4614: [2516] disable PointerEvents
- // [1] https://developer.mozilla.org/en-US/docs/Web/API/PointerEvent
-user_pref("dom.w3c_pointer_events.enabled", false);
-// 4615: [2618] disable exposure of system colors to CSS or canvas [FF44+]
- // [NOTE] See second listed bug: may cause black on black for elements with undefined colors
- // [SETUP-CHROME] Might affect CSS in themes and extensions
- // [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=232227,1330876
-user_pref("ui.use_standins_for_native_colors", true);
-// 4616: enforce prefers-color-scheme as light [FF67+]
- // 0=light, 1=dark : This overrides your OS value
-//;user_pref("ui.systemUsesDarkTheme", 0); // [HIDDEN PREF]
-// 4617: enforce prefers-reduced-motion as no-preference [FF63+] [RESTART]
- // 0=no-preference, 1=reduce
-//;user_pref("ui.prefersReducedMotion", 0); // [HIDDEN PREF]
+ // user_pref("media.navigator.enabled", false);
+ // user_pref("media.ondevicechange.enabled", false);
+ // user_pref("media.video_stats.enabled", false);
+ // user_pref("media.webspeech.synth.enabled", false);
+ // user_pref("webgl.enable-debug-renderer-info", false);
+ // user_pref("dom.maxHardwareConcurrency", 2);
+ // user_pref("font.system.whitelist", ""); // [HIDDEN PREF]
+ // user_pref("general.appname.override", ""); // [HIDDEN PREF]
+ // user_pref("general.appversion.override", ""); // [HIDDEN PREF]
+ // user_pref("general.buildID.override", ""); // [HIDDEN PREF]
+ // user_pref("general.oscpu.override", ""); // [HIDDEN PREF]
+ // user_pref("general.platform.override", ""); // [HIDDEN PREF]
+ // user_pref("general.useragent.override", ""); // [HIDDEN PREF]
+ // user_pref("ui.use_standins_for_native_colors", true);
-/*** [SECTION 4700]: RFP ALTERNATIVES (NAVIGATOR / USER AGENT (UA) SPOOFING)
- This is FYI ONLY. These prefs are INSUFFICIENT(a) on their own, you need
- to use RFP (4500) or an extension, in which case they become POINTLESS.
- (a) Many of the components that make up your UA can be derived by other means.
- And when those values differ, you provide more bits and raise entropy.
- Examples of leaks include workers, navigator objects, date locale/formats,
- iframes, headers, tcp/ip attributes, feature detection, and **many** more.
- ALL values below intentionally left blank - use RFP, or get a vetted, tested
- extension and mimic RFP values to *lower* entropy, or randomize to *raise* it
+/*** [SECTION 9000]: PERSONAL
+ Non-project related but useful. If any interest you, add them to your overrides
-user_pref("_user.js.parrot", "4700 syntax error: the parrot's taken 'is last bow");
-/* 4701: navigator.userAgent ***/
- // user_pref("general.useragent.override", ""); // [HIDDEN PREF]
-/* 4702: navigator.buildID
- * Revealed build time down to the second. In FF64+ it now returns a fixed timestamp
- * [1] https://bugzilla.mozilla.org/583181
- * [2] https://www.fxsitecompat.com/en-CA/docs/2018/navigator-buildid-now-returns-a-fixed-timestamp/ ***/
- // user_pref("general.buildID.override", ""); // [HIDDEN PREF]
-/* 4703: navigator.appName ***/
- // user_pref("general.appname.override", ""); // [HIDDEN PREF]
-/* 4704: navigator.appVersion ***/
- // user_pref("general.appversion.override", ""); // [HIDDEN PREF]
-/* 4705: navigator.platform ***/
- // user_pref("general.platform.override", ""); // [HIDDEN PREF]
-/* 4706: navigator.oscpu ***/
- // user_pref("general.oscpu.override", ""); // [HIDDEN PREF]
-/*** [SECTION 5000]: PERSONAL
- Non-project related but useful. If any of these interest you, add them to your overrides ***/
-user_pref("_user.js.parrot", "5000 syntax error: this is an ex-parrot!");
-/* WELCOME & WHAT's NEW NOTICES ***/
- // user_pref("browser.startup.homepage_override.mstone", "ignore"); // master switch
+user_pref("_user.js.parrot", "9000 syntax error: the parrot's cashed in 'is chips!");
+/* WELCOME & WHAT'S NEW NOTICES ***/
+user_pref("browser.startup.homepage_override.mstone", "ignore"); // master switch
// user_pref("startup.homepage_welcome_url", "");
// user_pref("startup.homepage_welcome_url.additional", "");
// user_pref("startup.homepage_override_url", ""); // What's New page after updates
@@ -1655,121 +1364,102 @@
// user_pref("full-screen-api.warning.timeout", 0);
// user_pref("browser.download.autohideButton", false); // [FF57+]
+ // user_pref("ui.systemUsesDarkTheme", 1); // [FF67+] [HIDDEN PREF]
+ // 0=light, 1=dark: with RFP this only affects chrome
// user_pref("toolkit.legacyUserProfileCustomizations.stylesheets", true); // [FF68+] allow userChrome/userContent
+ // user_pref("ui.prefersReducedMotion", 1); // disable chrome animations [FF77+] [RESTART] [HIDDEN PREF]
+ // 0=no-preference, 1=reduce: with RFP this only affects chrome
// user_pref("accessibility.typeaheadfind", true); // enable "Find As You Type"
// user_pref("clipboard.autocopy", false); // disable autocopy default [LINUX]
// user_pref("layout.spellcheckDefault", 2); // 0=none, 1-multi-line, 2=multi-line & single-line
// user_pref("browser.backspace_action", 2); // 0=previous page, 1=scroll up, 2=do nothing
+ // user_pref("browser.quitShortcut.disabled", true); // disable Ctrl-Q quit shortcut [LINUX] [MAC] [FF87+]
// user_pref("browser.tabs.closeWindowWithLastTab", false);
// user_pref("browser.tabs.loadBookmarksInTabs", true); // open bookmarks in a new tab [FF57+]
// user_pref("browser.urlbar.decodeURLsOnCopy", true); // see bugzilla 1320061 [FF53+]
// user_pref("general.autoScroll", false); // middle-click enabling auto-scrolling [DEFAULT: false on Linux]
// user_pref("ui.key.menuAccessKey", 0); // disable alt key toggling the menu bar [RESTART]
// user_pref("view_source.tab", false); // view "page/selection source" in a new window [FF68+, FF59 and under]
-/* UX FEATURES: disable and hide the icons and menus ***/
- // user_pref("browser.messaging-system.whatsNewPanel.enabled", false); // What's New [FF69+]
+user_pref("browser.messaging-system.whatsNewPanel.enabled", false); // What's New toolbar icon [FF69+]
// user_pref("extensions.pocket.enabled", false); // Pocket Account [FF46+]
+ // user_pref("extensions.screenshots.disabled", true); // [FF55+]
// user_pref("identity.fxaccounts.enabled", false); // Firefox Accounts & Sync [FF60+] [RESTART]
// user_pref("reader.parse-on-load.enabled", false); // Reader View
// user_pref("browser.bookmarks.max_backups", 2);
- // user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons", false); // disable CFR [FF67+]
+user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons", false); // disable CFR [FF67+]
// [SETTING] General>Browsing>Recommend extensions as you browse
- // user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.features", false); // disable CFR [FF67+]
+user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.features", false); // disable CFR [FF67+]
// [SETTING] General>Browsing>Recommend features as you browse
// user_pref("network.manage-offline-status", false); // see bugzilla 620472
// user_pref("xpinstall.signatures.required", false); // enforced extension signing (Nightly/ESR)
/*** [SECTION 9999]: DEPRECATED / REMOVED / LEGACY / RENAMED
- Documentation denoted as [-]. Items deprecated in FF68 or earlier have been archived at [1],
- which also provides a link-clickable, viewer-friendly version of the deprecated bugzilla tickets
- [1] https://github.com/ghacksuserjs/ghacks-user.js/issues/123
+ Documentation denoted as [-]. Items deprecated in FF78 or earlier have been archived at [1]
+ [1] https://github.com/arkenfox/user.js/issues/123
-user_pref("_user.js.parrot", "9999 syntax error: the parrot's deprecated!");
-/* ESR68.x still uses all the following prefs
+user_pref("_user.js.parrot", "9999 syntax error: the parrot's shuffled off 'is mortal coil!");
+/* ESR78.x still uses all the following prefs
// [NOTE] replace the * with a slash in the line above to re-enable them
-// 1405: disable WOFF2 (Web Open Font Format) [FF35+]
- // [-] https://bugzilla.mozilla.org/1556991
- // user_pref("gfx.downloadable_fonts.woff2.enabled", false);
-// 1802: enforce click-to-play for plugins
- // [-] https://bugzilla.mozilla.org/1519434
-user_pref("plugins.click_to_play", true); // [DEFAULT: true FF25+]
-// 2033: disable autoplay for muted videos [FF63+] - replaced by 'media.autoplay.default' options (2030)
- // [-] https://bugzilla.mozilla.org/1562331
- // user_pref("media.autoplay.allow-muted", false);
-// 2608: disable WebIDE and ADB extension download
- // [1] https://trac.torproject.org/projects/tor/ticket/16222
- // [-] https://bugzilla.mozilla.org/1539462
-user_pref("devtools.webide.enabled", false); // [DEFAULT: false FF70+]
-user_pref("devtools.webide.autoinstallADBExtension", false); // [FF64+]
-// 2731: enforce websites to ask to store data for offline use
- // [1] https://support.mozilla.org/questions/1098540
- // [2] https://bugzilla.mozilla.org/959985
- // [-] https://bugzilla.mozilla.org/1574480
-user_pref("offline-apps.allow_by_default", false);
-// 0105a: disable Activity Stream telemetry
- // [-] https://bugzilla.mozilla.org/1597697
-user_pref("browser.newtabpage.activity-stream.telemetry.ping.endpoint", "");
-// 0330: disable Hybdrid Content telemetry
- // [-] https://bugzilla.mozilla.org/1520491
-user_pref("toolkit.telemetry.hybridContent.enabled", false); // [FF59+]
-// 2720: enforce IndexedDB (IDB) as enabled
- // IDB is required for extensions and Firefox internals (even before FF63 in [1])
- // To control *website* IDB data, control allowing cookies and service workers, or use
- // Temporary Containers. To mitigate *website* IDB, FPI helps (4001), and/or sanitize
- // on close (Offline Website Data, see 2800) or on-demand (Ctrl-Shift-Del), or automatically
- // via an extension. Note that IDB currently cannot be sanitized by host.
- // [1] https://blog.mozilla.org/addons/2018/08/03/new-backend-for-storage-local-api/
- // [-] https://bugzilla.mozilla.org/1488583
-user_pref("dom.indexedDB.enabled", true); // [DEFAULT: true]
-// 0203: use Mozilla geolocation service instead of Google when geolocation is enabled
- // Optionally enable logging to the console (defaults to false)
- // [-] https://bugzilla.mozilla.org/1613627
-user_pref("geo.wifi.uri", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
- // user_pref("geo.wifi.logging.enabled", true); // [HIDDEN PREF]
-// 1704: set behaviour on "+ Tab" button to display container menu [FF53+] [SETUP-CHROME]
- // 0=no menu (default), 1=show when clicked, 2=show on long press
- // [1] https://bugzilla.mozilla.org/1328756
- // [-] https://bugzilla.mozilla.org/1606265
-user_pref("privacy.userContext.longPressBehavior", 2);
- // [-] https://bugzilla.mozilla.org/1477756
-user_pref("webgl.disable-extensions", true);
-// 0401: sanitize blocklist url
- // [2] https://trac.torproject.org/projects/tor/ticket/16931
- // [-] https://bugzilla.mozilla.org/1618188
-user_pref("extensions.blocklist.url", "https://blocklists.settings.services.mozilla.com/v1/blocklist/3/%APP_ID%/%APP_VERSION%/");
-// 0850e: disable location bar one-off searches [FF51+]
- // [1] https://www.ghacks.net/2016/08/09/firefox-one-off-searches-address-bar/
- // [-] https://bugzilla.mozilla.org/1628926
- // user_pref("browser.urlbar.oneOffSearches", false);
-// 2605: block web content in file processes [FF55+]
- // [SETUP-WEB] You may want to disable this for corporate or developer environments
- // [1] https://bugzilla.mozilla.org/1343184
- // [-] https://bugzilla.mozilla.org/1603007
-user_pref("browser.tabs.remote.allowLinkedWebInFileUriProcess", false);
-// 2031: disable autoplay of HTML5 media if you interacted with the site [FF66+] - replaced by 'media.autoplay.blocking_policy'
- // [-] https://bugzilla.mozilla.org/1509933
-user_pref("media.autoplay.enabled.user-gestures-needed", false);
-// 5000's: disable chrome animations - replaced FF77+ by 'ui.prefersReducedMotion' (4520)
- // [-] https://bugzilla.mozilla.org/1640501
- // user_pref("toolkit.cosmeticAnimations.enabled", false); // [FF55+]
+// 0212: enforce fallback text encoding to match en-US
+ // When the content or server doesn't declare a charset the browser will
+ // fallback to the "Current locale" based on your application language
+ // [TEST] https://hsivonen.com/test/moz/check-charset.htm
+ // [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/20025
+ // [-] https://bugzilla.mozilla.org/1603712
+user_pref("intl.charset.fallback.override", "windows-1252");
+// 0206: disable geographically specific results/search engines e.g. "browser.search.*.US"
+ // i.e. ignore all of Mozilla's various search engines in multiple locales
+ // [-] https://bugzilla.mozilla.org/1619926
+user_pref("browser.search.geoSpecificDefaults", false);
+user_pref("browser.search.geoSpecificDefaults.url", "");
+// 1205: disable SSL Error Reporting
+ // [1] https://firefox-source-docs.mozilla.org/main/65.0/browser/base/sslerrorreport/preferences.html
+ // [-] https://bugzilla.mozilla.org/1681839
+user_pref("security.ssl.errorReporting.automatic", false);
+user_pref("security.ssl.errorReporting.enabled", false);
+user_pref("security.ssl.errorReporting.url", "");
+// 2653: disable hiding mime types (Options>General>Applications) not associated with a plugin
+ // [-] https://bugzilla.mozilla.org/1581678
+user_pref("browser.download.hide_plugins_without_extensions", false);
+// 0105d: disable Activity Stream recent Highlights in the Library [FF57+]
+ // [-] https://bugzilla.mozilla.org/1689405
+ // user_pref("browser.library.activity-stream.enabled", false);
+// 8002: disable PointerEvents
+ // [1] https://developer.mozilla.org/docs/Web/API/PointerEvent
+ // [-] https://bugzilla.mozilla.org/1688105
+ // user_pref("dom.w3c_pointer_events.enabled", false);
+// 0309: disable sending Flash crash reports
+ // [-] https://bugzilla.mozilla.org/1682030 [underlying NPAPI code removed]
+user_pref("dom.ipc.plugins.flash.subprocess.crashreporter.enabled", false);
+// 0310: disable sending the URL of the website where a plugin crashed
+ // [-] https://bugzilla.mozilla.org/1682030 [underlying NPAPI code removed]
+user_pref("dom.ipc.plugins.reportCrashURL", false);
+// 1243: block unencrypted requests from Flash on encrypted pages to mitigate MitM attacks [FF59+]
+ // [1] https://bugzilla.mozilla.org/1190623
+ // [-] https://bugzilla.mozilla.org/1682030 [underlying NPAPI code removed]
+user_pref("security.mixed_content.block_object_subrequest", true);
+// 1803: disable Flash plugin
+ // 0=deactivated, 1=ask, 2=enabled
+ // ESR52.x is the last branch to fully support NPAPI, FF52+ stable only supports Flash
+ // [NOTE] You can still override individual sites via site permissions
+ // [-] https://bugzilla.mozilla.org/1682030 [underlying NPAPI code removed]
+user_pref("plugin.state.flash", 0); // [DEFAULT: 1]
+// 0708: disable FTP [FF60+]
+ // [-] https://bugzilla.mozilla.org/1574475
+ // user_pref("network.ftp.enabled", false); // [DEFAULT: false FF88+]
+// 7001: enforce no offline cache storage (appCache) [FF71+]
+ // [-] https://bugzilla.mozilla.org/1694662
+user_pref("browser.cache.offline.storage.enable", false); // [DEFAULT: false FF84+]
/* END: internal custom pref to test for syntax errors ***/