* version 68: Knock on Pants
* "It's like thunder, lightning... the way you wear me is frightening"
* 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
0. Consider using Tor Browser if it meets your needs or fits your threat model better
* https://www.torproject.org/about/torusers.html.en
* 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 (0402)
* 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 for ESR users
- 9999s: reset deprecated prefs in about:config or enable relevant section(s) 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:
[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
0400: BLOCKLISTS / SAFE BROWSING
0500: SYSTEM ADD-ONS / EXPERIMENTS
0600: BLOCK IMPLICIT OUTBOUND
0700: HTTP* / TCP/IP / DNS / PROXY / SOCKS etc
0800: LOCATION BAR / SEARCH BAR / SUGGESTIONS / HISTORY / FORMS
1000: CACHE / SESSION (RE)STORE / FAVICONS
1200: HTTPS (SSL/TLS / OCSP / CERTS / HPKP / CIPHERS)
2000: MEDIA / CAMERA / MIC
2200: WINDOW MEDDLING & LEAKS / POPUPS
2400: DOM (DOCUMENT OBJECT MODEL) & JAVASCRIPT
2500: HARDWARE FINGERPRINTING
4000: FPI (FIRST PARTY ISOLATION)
4500: RFP (RESIST FINGERPRINTING)
4700: RFP ALTERNATIVES (NAVIGATOR / USER AGENT (UA) SPOOFING)
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
* 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?");
/*** [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)
* [SETTING] General>Startup>Restore previous session ***/
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 ***/
//;user_pref("browser.startup.homepage", "about:blank");
* true=Activity Stream (default, see 0105), false=blank page
* [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**
* [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);
user_pref("browser.newtabpage.activity-stream.telemetry.ping.endpoint", "");
/* 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.asrouter.providers.snippets", "");
user_pref("browser.newtabpage.activity-stream.feeds.snippets", false);
/* 0105c: disable Activity Stream Top Stories, Pocket-based and/or sponsored content ***/
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);
/* 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 ***/
user_pref("_user.js.parrot", "0200 syntax error: the parrot's definitely deceased!");
/* 0201: disable Location-Aware Browsing
* [1] https://www.mozilla.org/firefox/geolocation/ ***/
// user_pref("geo.enabled", false);
/* 0201b: set a default permission for Location [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);
/* 0202: disable GeoIP-based search results
* [NOTE] May not be hidden if Firefox has changed your settings due to your locale
* [1] https://trac.torproject.org/projects/tor/ticket/16254
* [2] https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_geolocation-for-default-search-engine ***/
user_pref("browser.search.region", "RU"); // [HIDDEN PREF]
user_pref("browser.search.geoip.url", "");
/* 0205: set Firefox language [FF59+] [RESTART]
* Go to the end of about:support to view Internationalization & Localization settings
* If set to empty, the OS locales are used. If not set at all, default locale is used
* This is the language used in menus, about pages, messages, and notifications from Firefox ***/
// user_pref("intl.locale.requested", "en-US"); // [HIDDEN PREF]
/* 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", "");
/* 0207: set preferred language for diplaying web pages
* [TEST] https://addons.mozilla.org/about ***/
//;user_pref("intl.accept_languages", "en-US, en");
/* 0208: enforce US English locale regardless of the system locale
* [1] https://bugzilla.mozilla.org/867501 ***/
//;user_pref("javascript.use_us_english_locale", true); // [HIDDEN PREF]
/* 0209: use APP locale over OS locale in regional preferences [FF56+]
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1379420,1364789 ***/
//;user_pref("intl.regional_prefs.use_os_locales", false);
/* 0210: use Mozilla geolocation service instead of Google when geolocation is enabled
* Optionally enable logging to the console (defaults to false) ***/
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]
/* 0211: 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]
/*** [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.
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
* [SETTING] General>Firefox Updates>Check for updates but let you choose... ***/
user_pref("app.update.auto", false);
/* 0302b: disable auto-INSTALLING extension and theme updates (after the check in 0301b)
* [SETTING] about:addons>Extensions>[cog-wheel-icon]>Update Add-ons Automatically (toggle) ***/
// user_pref("extensions.update.autoUpdateDefault", false);
/* 0306: disable extension metadata
* used when installing/updating an extension, and in daily background update checks: if false, it
* hides the expanded text description (if it exists) when you "show more details about an addon" ***/
// user_pref("extensions.getAddons.cache.enabled", false);
/* 0308: disable search update
* [SETTING] General>Firefox Updates>Automatically update 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) ***/
user_pref("extensions.getAddons.showPane", false); // [HIDDEN PREF]
user_pref("extensions.webservice.discoverURL", "");
/* 0321: disable recommendations in about:addons' Extensions and Themes panes [FF68+] ***/
user_pref("extensions.getAddons.discovery.api_url", "");
user_pref("extensions.htmlaboutaddons.discover.enabled", false);
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]
* [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.server", "data:,");
user_pref("toolkit.telemetry.archive.enabled", false);
user_pref("toolkit.telemetry.newProfilePing.enabled", false); // [FF55+]
user_pref("toolkit.telemetry.shutdownPingSender.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+]
user_pref("toolkit.telemetry.hybridContent.enabled", false); // [FF59+]
/* 0331: 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)
* [NOTE] This pref has no effect when Health Reports (0340) are disabled
* [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 rec.
* [1] https://support.mozilla.org/kb/personalized-extension-recommendations ***/
user_pref("browser.discovery.enabled", false);
/* 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
* [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send backlogged crash reports ***/
user_pref("browser.crashReports.unsubmittedCheck.autoSubmit2", false); // [FF58+]
/* 0370: disable Pocket [FF46+]
* Pocket is a third party (now owned by Mozilla) "save for later" cloud service
* [1] https://en.wikipedia.org/wiki/Pocket_(application)
* [2] https://www.gnu.gl/blog/Posts/multiple-vulnerabilities-in-pocket/ ***/
user_pref("extensions.pocket.enabled", false);
/* 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("captivedetect.canonicalURL", "");
user_pref("network.captive-portal-service.enabled", false); // [FF52+]
/* 0391: disable Network Connectivity checks [FF65+]
* [1] https://bugzilla.mozilla.org/1460537 ***/
user_pref("network.connectivity-service.enabled", false);
/*** [SECTION 0400]: BLOCKLISTS / SAFE BROWSING (SB)
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)
#Required reading [#] https://feeding.cloud.geek.nz/posts/how-safe-browsing-works-in-firefox/
[1] https://wiki.mozilla.org/Security/Safe_Browsing
user_pref("_user.js.parrot", "0400 syntax error: the parrot's passed on!");
/* 0401: enforce Firefox blocklist, but sanitize blocklist url
* [NOTE] It includes updates for "revoked certificates"
* [1] https://blog.mozilla.org/security/2015/03/03/revoking-intermediate-certificates-introducing-onecrl/
* [2] https://trac.torproject.org/projects/tor/ticket/16931 ***/
user_pref("extensions.blocklist.enabled", true); // [DEFAULT: true]
user_pref("extensions.blocklist.url", "https://blocklists.settings.services.mozilla.com/v1/blocklist/3/%APP_ID%/%APP_VERSION%/");
/* 0402: disable binaries NOT in Safe Browsing local lists being checked
* This is a real-time check with Google services
* [SETUP-SECURITY] If you do not understand this, or if you want this protection, then override it ***/
user_pref("browser.safebrowsing.downloads.remote.enabled", false);
/* 0403: disable 'ignore this warning' on Safe Browsing warnings
* 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 & Passwords>Autofill addresses
* [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 ***/
user_pref("network.dns.disablePrefetch", true);
user_pref("network.dns.disablePrefetchFromHTTPS", true); // [HIDDEN PREF]
/* 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.http.speculative-parallel-limit", 0);
/* 0606: disable pings (but enforce same host in case)
* [1] http://kb.mozillazine.org/Browser.send_pings
* [2] http://kb.mozillazine.org/Browser.send_pings.require_same_host ***/
user_pref("browser.send_pings", false); // [DEFAULT: false]
user_pref("browser.send_pings.require_same_host", true);
/*** [SECTION 0700]: HTTP* / TCP/IP / DNS / PROXY / SOCKS etc ***/
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.
* Firefox telemetry (April 2019) shows only 5% of all connections are IPv6.
* [NOTE] This is just 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 maksing your IP, then it can only help.
* [TEST] http://ipv6leak.com/
* [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) ***/
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 35% (April 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
* 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] http://kb.mozillazine.org/Network.proxy.socks_remote_dns
* [2] https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO/WebBrowsers ***/
user_pref("network.proxy.socks_remote_dns", true);
/* 0707: disable (or setup) DNS-over-HTTPS (DoH) [FF60+]
* TRR = Trusted Recursive Resolver
* .mode: 0=off, 1=race, 2=TRR first, 3=TRR only, 4=race for stats but always use native result
* [WARNING] DoH bypasses hosts and gives info to yet another party (e.g. Cloudflare)
* [1] https://www.ghacks.net/2018/04/02/configure-dns-over-https-in-firefox/
* [2] https://hacks.mozilla.org/2018/05/a-cartoon-intro-to-dns-over-https/ ***/
// user_pref("network.trr.mode", 0);
// user_pref("network.trr.bootstrapAddress", "");
// user_pref("network.trr.uri", "");
/* 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+]
* [SETUP-CHROME] Can break extensions for profiles on network shares
* [1] https://trac.torproject.org/projects/tor/ticket/26424 ***/
user_pref("network.file.disable_unc_paths", true); // [HIDDEN PREF]
/* 0710: disable GIO as a potential proxy bypass vector
* 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://trac.torproject.org/23044
* [3] https://en.wikipedia.org/wiki/GVfs
* [4] https://en.wikipedia.org/wiki/GIO_(software) ***/
user_pref("network.gio.supported-protocols", ""); // [HIDDEN PREF]
/*** [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/
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.
* Examples: "secretplace,com", "secretplace/com", "secretplace com", "secret place.com"
* [NOTE] Search buttons in the dropdown work, but hitting 'enter' in the location bar will fail
* [TIP] You can add keywords to search engines in options (e.g. 'd' for DuckDuckGo) and
* the dropdown will now auto-select it and you can then hit 'enter' and it will work
* [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);
/* 0802: disable location bar domain guessing
* domain guessing intercepts DNS "hostname not found errors" and resends a
* request (e.g. by adding www or .com). This is inconsistent use (e.g. FQDNs), does not work
* via Proxy Servers (different error), is a flawed use of DNS (TLDs: why treat .com
* as the 411 for DNS errors?), privacy issues (why connect to sites you didn't
* intend to), can leak sensitive data (e.g. query strings: e.g. Princeton attack),
* and is a security risk (e.g. common typos & malicious sites set up to exploit this) ***/
user_pref("browser.fixup.alternate.enabled", false);
/* 0803: display all parts of the url in the location bar ***/
user_pref("browser.urlbar.trimURLs", false);
/* 0804: limit history leaks via enumeration (PER TAB: back/forward)
* This is a PER TAB session history. You still have a full history stored under all history
* default=50, minimum=1=currentpage, 2 is the recommended minimum as some pages
* use it as a means of referral (e.g. hotlinking), 4 or 6 or 10 may be more practical ***/
user_pref("browser.sessionhistory.max_entries", 10);
/* 0805: disable CSS querying page history - 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] http://lcamtuf.coredump.cx/yahh/ (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
* [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+]
* [1] https://bugzilla.mozilla.org/1348275 ***/
user_pref("browser.urlbar.speculativeConnect.enabled", false);
/* 0850a: disable location bar suggestion types
* If all three suggestion types are false, search engine keywords are disabled
* [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);
/* 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] http://kb.mozillazine.org/Inline_autocomplete ***/
// user_pref("browser.urlbar.autoFill", false);
/* 0850e: disable location bar one-off searches [FF51+]
* [1] https://www.ghacks.net/2016/08/09/firefox-one-off-searches-address-bar/ ***/
// user_pref("browser.urlbar.oneOffSearches", false);
/* 0860: disable search and form history [SETUP-WEB]
* [WARNING] Autocomplete form data is still (in April 2019) easily read by third parties, see [1]
* [NOTE] We also clear formdata on exiting Firefox (see 2803)
* [SETTING] Privacy & Security>History>Custom Settings>Remember search and form history
* [1] https://blog.mindedsecurity.com/2011/10/autocompleteagain.html ***/
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);
/*** [SECTION 0900]: PASSWORDS ***/
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>Forms & Passwords>Ask to save logins and passwords for websites ***/
// user_pref("signon.rememberSignons", false);
/* 0902: use a master password (recommended if you save passwords)
* There are no preferences for this. It is all handled internally.
* [SETTING] Privacy & Security>Forms & 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) ***/
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
* can leak in cross-site forms AND be spoofed
* [NOTE] Password will still be auto-filled after a user name is manually entered
* [1] http://kb.mozillazine.org/Signon.autofillForms ***/
user_pref("signon.autofillForms", false);
/* 0909: 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+]
* 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/ ***/
user_pref("network.auth.subresource-http-auth-allow", 1);
/*** [SECTION 1000]: CACHE / SESSION (RE)STORE / FAVICONS
ETAG [1] and other [2][3] cache tracking/fingerprinting techniques can be averted by
disabling *BOTH* disk (1001) and memory (1003) cache. ETAGs can also be neutralized
by modifying response headers [4]. Another solution is to use a hardened configuration
with Temporary Containers [5]. Alternatively, you can *LIMIT* exposure by clearing
cache on close (2803). or on a regular basis manually or with an extension.
[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://github.com/ghacksuserjs/ghacks-user.js/wiki/4.2.4-Header-Editor
[5] https://medium.com/@stoically/enhance-your-privacy-in-firefox-with-temporary-containers-33925cd6cd21
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) ***/
//;user_pref("browser.cache.disk.enable", false);
/* 1002: disable disk cache for SSL pages
* [1] http://kb.mozillazine.org/Browser.cache.disk_cache_ssl ***/
//;user_pref("browser.cache.disk_cache_ssl", false);
/* 1003: disable memory cache
/* capacity: -1=determine dynamically (default), 0=none, n=memory capacity in kilobytes
* [NOTE] Not recommended due to performance issues ***/
// user_pref("browser.cache.memory.enable", false);
// user_pref("browser.cache.memory.capacity", 0); // [HIDDEN PREF]
/* 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]
/** 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:
* 0=everywhere, 1=unencrypted sites, 2=nowhere ***/
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
* [1] https://bugzilla.mozilla.org/1304389 ***/
user_pref("browser.sessionstore.interval", 30000);
/* 1024: 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
* 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.
* If set to false then the shortcuts use a generic Firefox icon ***/
user_pref("browser.shell.shortcutFavicons", false);
/* 1031: disable favicons in tabs and new bookmarks
* bookmark favicons are stored as data blobs in favicons.sqlite ***/
// 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)
Note that your cipher and other settings can be used server side as a fingerprint attack
vector, see [1] (It's quite technical but the first part is easy to understand
and you can stop reading when you reach the second section titled "Enter Bro")
Option 1: Use defaults for ciphers (1260's). There is nothing *weak* about these, but
due to breakage, browsers can't deprecate them until the web stops using them
Option 2: Disable the ciphers in 1261, 1262 and 1263. These shouldn't break anything.
Optionally, disable the ciphers in 1264.
[1] https://www.securityartwork.es/2017/02/02/tls-client-fingerprinting-with-bro/
user_pref("_user.js.parrot", "1200 syntax error: the parrot's a stiff!");
/** SSL (Secure Sockets Layer) / TLS (Transport Layer Security) ***/
/* 1201: disable old SSL/TLS "insecure" renegotiation (vulnerable to a MiTM attack)
* [SETUP-WEB] <2% of secure sites do NOT support the newer "secure" renegotiation, see [2]
* [1] https://wiki.mozilla.org/Security:Renegotiation
* [2] 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
* [WARNING] Leave these at default, otherwise you alter your TLS fingerprint.
* Firefox telemetry (April 2019) shows only 0.5% of TLS web traffic uses 1.0 or 1.1 ***/
// user_pref("security.tls.version.min", 3);
// user_pref("security.tls.version.max", 4);
/* 1203: 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]
/* 1204: 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", "");
/* 1205: 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)
* 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
* [1] https://en.wikipedia.org/wiki/Ocsp ***/
user_pref("security.OCSP.enabled", 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)
* It is pointless to soft-fail when an OCSP fetch fails: you cannot confirm a cert is still valid (it
* could have been revoked) and/or you could be under attack (e.g. malicious blocking of OCSP servers)
* [1] https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/
* [2] https://www.imperialviolet.org/2014/04/19/revchecking.html ***/
user_pref("security.OCSP.require", true);
/** 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.
* [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]
* 0=disable detecting Family Safety mode and importing the root
* 1=only attempt to detect Family Safety mode (don't import the root)
* 2=detect Family Safety mode and import the root
* [1] https://trac.torproject.org/projects/tor/ticket/21686 ***/
user_pref("security.family_safety.mode", 0);
/* 1222: disable intermediate certificate caching (fingerprinting attack vector) [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.
* [TEST] https://fiprinca.0x90.eu/poc/
* [1] https://bugzilla.mozilla.org/1334485 - related bug
* [2] https://bugzilla.mozilla.org/1216882 - related bug (see comment 9) ***/
// 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
* [WARNING] 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://trac.torproject.org/projects/tor/ticket/16206 ***/
user_pref("security.cert_pinning.enforcement_level", 2);
/* 1240: disable insecure active content on https pages
* [1] https://trac.torproject.org/projects/tor/ticket/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);
/** CIPHERS [see the section 1200 intro] ***/
/* 1261: disable 3DES (effective key size < 128)
* [1] https://en.wikipedia.org/wiki/3des#Security
* [2] http://en.citizendium.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);
/* 1262: disable 128 bits ***/
// user_pref("security.ssl3.ecdhe_ecdsa_aes_128_sha", false);
// user_pref("security.ssl3.ecdhe_rsa_aes_128_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);
// user_pref("security.ssl3.dhe_rsa_aes_256_sha", false);
/* 1264: disable the remaining non-modern cipher suites as of FF52 ***/
// user_pref("security.ssl3.rsa_aes_128_sha", false);
// user_pref("security.ssl3.rsa_aes_256_sha", false);
/** UI (User Interface) ***/
/* 1270: display warning (red padlock) for "broken security" (see 1201)
* [1] https://wiki.mozilla.org/Security:Renegotiation ***/
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)
* [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
* only works when it's possible to add an exception
* 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+]
user_pref("security.insecure_connection_text.enabled", true); // [FF60+]
// user_pref("security.insecure_connection_icon.pbmode.enabled", true); // [FF59+] private windows only
// user_pref("security.insecure_connection_text.pbmode.enabled", true); // [FF60+] private windows only
/*** [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] Disabling fonts can uglify the web a fair bit.
* [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://trac.torproject.org/projects/tor/ticket/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 ***/
user_pref("gfx.font_rendering.opentype_svg.enabled", false);
/* 1405: disable WOFF2 (Web Open Font Format) [FF35+] ***/
// user_pref("gfx.downloadable_fonts.woff2.enabled", false);
/* 1408: disable graphite which FF49 turned back on by default
* In the past it had security issues. Update: This continues to be the case, see [1]
* [1] https://www.mozilla.org/security/advisories/mfsa2017-15/#CVE-2017-7778 ***/
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]
/*** [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/
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
* 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 ***/
user_pref("network.http.referer.XOriginPolicy", 1);
/* 1604: CROSS ORIGIN: control the amount of 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 Tracking Protection regardless of this pref
* [SETTING] Privacy & Security>Content Blocking>Send websites a "Do Not Track"... ***/
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
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+]
* [SETTING] General>Tabs>Enable Container Tabs ***/
user_pref("privacy.userContext.enabled", true);
/* 1703: enable a private container for thumbnail loads [FF51+] ***/
user_pref("privacy.usercontext.about_newtab_segregation.enabled", true); // [DEFAULT: true in FF61+]
/* 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 ***/
user_pref("privacy.userContext.longPressBehavior", 2);
/*** [SECTION 1800]: PLUGINS ***/
user_pref("_user.js.parrot", "1800 syntax error: the parrot's pushing up daisies!");
/* 1802: enable click to play and set to 0 minutes ***/
user_pref("plugins.click_to_play", true);
user_pref("plugin.sessionPermissionNow.intervalInMinutes", 0);
/* 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 ***/
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
* in your threat model, and you want Real-Time Communication, this is the pref for you
* [1] https://www.privacytools.io/#webrtc ***/
user_pref("media.peerconnection.enabled", false);
/* 2002: limit WebRTC IP leaks if using WebRTC
* [TEST] https://browserleaks.com/webrtc
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1189041,1297416
* [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+]
/* 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.dxgl.enabled", false); // [WINDOWS]
user_pref("webgl.enable-webgl2", false);
/* 2012: limit WebGL ***/
user_pref("webgl.min_capability_mode", true);
user_pref("webgl.disable-extensions", 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);
/* 2030: disable autoplay of HTML5 media [FF63+]
* 0=Allowed, 1=Blocked (2=Prompt - removed in FF66)
* [NOTE] You can set exceptions under site permissions
* [SETTING] Privacy & Security>Permissions>Block websites from automatically playing sound ***/
user_pref("media.autoplay.default", 1); // [DEFAULT: 1 in FF67+]
/* 2031: disable autoplay of HTML5 media if you interacted with the site [FF66+] ***/
user_pref("media.autoplay.enabled.user-gestures-needed", false);
/* 2032: disable audio autoplay in non-active tabs [FF51+]
* [1] https://www.ghacks.net/2016/11/14/firefox-51-blocks-automatic-audio-playback-in-non-active-tabs/ ***/
user_pref("media.block-autoplay-until-in-foreground", true); // [DEFAULT: true]
/* 2033: disable autoplay for muted videos [FF63+] ***/
// user_pref("media.autoplay.allow-muted", false);
/*** [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
* [1] http://kb.mozillazine.org/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://trac.torproject.org/projects/tor/ticket/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"
* [1] http://kb.mozillazine.org/Dom.popup_allowed_events ***/
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.
[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
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 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.
* [SETUP-WEB] Disabling service workers will break some sites. This pref is a master switch, and controls
* notifications (2304, 2305) and service worker cache (2740) - all three are inactive. Notifications are
* behind a prompt (2306). If you enable service workers, then you may want to look at those as well ***/
user_pref("dom.serviceWorkers.enabled", false);
/* 2304: disable Web Notifications
* [NOTE] Web Notifications require service workers (2302) and are behind a prompt (2306)
* [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+]
* web apps can receive messages pushed to them from a server, whether or
* not the web app is in the foreground, or even currently loaded
* [NOTE] Push Notifications require service workers (2302) and are behind a prompt (2306)
* [1] https://developer.mozilla.org/docs/Web/API/Push_API ***/
// user_pref("dom.push.enabled", false);
// user_pref("dom.push.connection.enabled", false);
// user_pref("dom.push.serverURL", "");
// user_pref("dom.push.userAgentID", "");
/* 2306: set a default permission for Notifications (both 2305 and 2306) [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 ***/
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-WEB] This will break some sites functionality such as pasting into facebook, wordpress
* this applies to onCut, onCopy, onPaste events - i.e. you have to interact with
* the website for it to look at the clipboard
* [1] https://www.ghacks.net/2014/01/08/block-websites-reading-modifying-clipboard-contents-firefox/ ***/
user_pref("dom.event.clipboardevents.enabled", false);
/* 2403: disable middlemouse paste leaking clipboard content on Linux after autoscroll
* Defense in depth if clipboard events are enabled (see 2402)
* [1] https://bugzilla.mozilla.org/1528289 */
user_pref("middlemouse.paste", false); // [DEFAULT: false on Windows]
/* 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 ***/
user_pref("dom.disable_beforeunload", true);
/* 2414: disable shaking the screen ***/
user_pref("dom.vibrator.enabled", false);
/* 2420: disable asm.js [FF22+] [SETUP-PERF]
* [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 help harden JS against exploits
* [WARNING] If false, causes the odd site issue and there is also a 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);
/* 2422: disable WebAssembly [FF52+] [SETUP-PERF]
* [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);
/*** [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);
/* 2504: 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);
/* 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);
/*** [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
* [1] https://support.mozilla.org/kb/accessibility-services ***/
user_pref("accessibility.force_disabled", 1);
/* 2602: disable sending additional analytics to web servers
* [1] https://developer.mozilla.org/docs/Web/API/Navigator/sendBeacon ***/
user_pref("beacon.enabled", false);
/* 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 ***/
user_pref("browser.pagethumbnails.capturing_disabled", true); // [HIDDEN PREF]
/* 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 ***/
user_pref("browser.tabs.remote.allowLinkedWebInFileUriProcess", false);
/* 2606: disable UITour backend so there is no chance that a remote page can use it ***/
user_pref("browser.uitour.enabled", false);
user_pref("browser.uitour.url", "");
/* 2607: disable various developer tools in browser context
* [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 WebIDE to prevent remote debugging and ADB extension download
* [1] https://trac.torproject.org/projects/tor/ticket/16222 ***/
user_pref("devtools.debugger.remote-enabled", false);
user_pref("devtools.webide.enabled", false);
user_pref("devtools.webide.autoinstallADBExtension", false); // [FF64+]
/* 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+]
* [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://trac.torproject.org/projects/tor/ticket/10089
* [2] http://kb.mozillazine.org/Middlemouse.contentLoadURL ***/
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 ***/
// 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. The downside: it will also
* display legitimate IDN's punycoded, which might be undesirable for users of non-latin alphabets
* [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/
* [4] https://www.xudongz.com/blog/2017/idn-phishing/ ***/
user_pref("network.IDN_show_punycode", true);
/* 2620: enable Firefox's built-in PDF reader [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.
* 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)
* [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("network.protocol-handler.external.ms-windows-store", false);
/* 2650: discourage downloading to desktop
* 0=desktop 1=downloads 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 [SETUP-CHROME]
* [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 ***/
user_pref("extensions.enabledScopes", 5); // [HIDDEN PREF]
user_pref("extensions.autoDisableScopes", 15); // [DEFAULT: 15]
/* 2662: disable webextension restrictions on certain mozilla domains (also see 4503) [FF60+]
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1384330,1406795,1415644,1453988 ***/
// user_pref("extensions.webextensions.restrictedDomains", "");
/* 2680: enable CSP (Content Security Policy)
* [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] http://kb.mozillazine.org/Disable_extension_install_delay_-_Firefox
* [2] 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
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"
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 (default), 1=(Block) All third-party cookies, 2=(Block) All cookies,
* 3=(Block) Cookies from unvisited sites, 4=(Block) Third-party trackers (FF63+)
* [NOTE] Value 4 is tied to the Tracking Protection lists
* [NOTE] You can set exceptions under site permissions or use an extension
* [SETTING] Privacy & Security>Content Blocking>Custom>Choose what to block>Cookies ***/
user_pref("network.cookie.cookieBehavior", 1);
/* 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
* [1] https://feeding.cloud.geek.nz/posts/tweaking-cookies-for-privacy-in-firefox/
* [2] http://kb.mozillazine.org/Network.cookie.thirdparty.sessionOnly ***/
//;user_pref("network.cookie.thirdparty.sessionOnly", true);
//;user_pref("network.cookie.thirdparty.nonsecureSessionOnly", true); // [FF58+]
/* 2703: delete cookies and site data on close
* 0=keep until they expire (default), 2=keep until you close Firefox
* [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);
/* 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/ ***/
user_pref("dom.indexedDB.enabled", true); // [DEFAULT: true]
/* 2730: disable offline cache ***/
user_pref("browser.cache.offline.enable", false);
/* 2731: enforce websites to ask to store data for offline use
* [1] https://support.mozilla.org/questions/1098540
* [2] https://bugzilla.mozilla.org/959985 ***/
user_pref("offline-apps.allow_by_default", false);
/* 2740: disable service worker cache and cache storage
* [NOTE] We clear service worker cache on exiting Firefox (see 2803)
* [1] https://w3c.github.io/ServiceWorker/#privacy ***/
// user_pref("dom.caches.enabled", false);
/* 2750: disable Storage API [FF51+]
* The API gives sites the ability to find out how much space they can use, how much
* they are already using, and even control whether or not they need to be alerted
* before the user agent disposes of site data in order to make room for other things.
* [1] https://developer.mozilla.org/docs/Web/API/StorageManager
* [2] https://developer.mozilla.org/docs/Web/API/Storage_API
* [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 ***/
// user_pref("dom.storage_access.enabled", false);
/*** [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
user_pref("_user.js.parrot", "2800 syntax error: the parrot's bleedin' demised!");
/* 2802: enable Firefox to clear items on shutdown (see 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 ***/
//;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.formdata", true); // Form & Search History
//;user_pref("privacy.clearOnShutdown.history", true); // Browsing & Download History
//;user_pref("privacy.clearOnShutdown.offlineApps", true); // Offline Website Data
//;user_pref("privacy.clearOnShutdown.sessions", true); // Active Logins
//;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' ***/
//;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.formdata", true); // Form & Search History
//;user_pref("privacy.cpd.history", true); // Browsing & Download History
//;user_pref("privacy.cpd.offlineApps", true); // Offline Website Data
user_pref("privacy.cpd.passwords", false); // this is not listed
//;user_pref("privacy.cpd.sessions", true); // Active Logins
user_pref("privacy.cpd.siteSettings", false); // Site Preferences
/* 2805: privacy.*.openWindows (clear session restore data) [FF34+]
* [NOTE] There is a years-old bug that these cause two windows when Firefox restarts.
* You do not need these anyway if session restore is cleared with history (see 2803) ***/
// 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 ***/
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 (FF68+)
** 1506693 - isolate pdfjs range-based requests (FF68+)
** 1330467 - isolate site permissions (coming)
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 ***/
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.
* [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 ***/
user_pref("privacy.firstparty.isolate.restrict_opener_access", true); // [DEFAULT: true]
// user_pref("privacy.firstparty.isolate.block_post_message", true); // [HIDDEN PREF]
/*** [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
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
** 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 Navigator API (see section 4700) (FF56+)
FF56: The version number will be rounded down to the nearest multiple of 10
FF57: The version number will match current ESR (1393283, 1418672, 1418162, 1511763)
FF59: The OS will be reported as Windows, OSX, Android, or Linux (to reduce breakage) (1404608)
FF66: The OS in HTTP Headers will be reduced to Windows or Android (1509829)
FF68: Reported OS versions updated to Windows 10, OS 10.14, and Adnroid 8.1 (1511434)
** 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, 0201b) (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 - 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 0207, 0208) (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 (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+)
** 1540726 - return "light" with prefers-color-scheme (FF67+)
[1] https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme
** 1564422 - spoof audioContext outputLatency (FF70+)
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).
* [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/ ***/
// 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
* [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 ***/
//;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
* [1] https://bugzilla.mozilla.org/1448423 ***/
user_pref("browser.startup.blankWindow", false);
/*** [SECTION 4600]: RFP ALTERNATIVES
* IF you DO use RFP (see 4500) then you DO NOT need these redundant prefs. In fact,
some even cause RFP to not behave as you would expect and alter your fingerprint.
Make sure they are RESET in about:config as per your Firefox version
* IF you DO NOT use RFP or are on ESR... then turn on each ESR section below
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://trac.torproject.org/projects/tor/ticket/21675
// [3] https://trac.torproject.org/projects/tor/ticket/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://trac.torproject.org/projects/tor/ticket/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("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://trac.torproject.org/projects/tor/ticket/13023
// 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://trac.torproject.org/projects/tor/ticket/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://trac.torproject.org/projects/tor/ticket/10286
// 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);
/*** [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 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
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("startup.homepage_welcome_url", "");
// user_pref("startup.homepage_welcome_url.additional", "");
// user_pref("startup.homepage_override_url", ""); // What's New page after updates
// user_pref("browser.tabs.warnOnClose", false);
// user_pref("browser.tabs.warnOnCloseOtherTabs", false);
// user_pref("browser.tabs.warnOnOpen", false);
// user_pref("full-screen-api.warning.delay", 0);
// user_pref("full-screen-api.warning.timeout", 0);
// user_pref("general.warnOnAboutConfig", false);
// user_pref("browser.aboutConfig.showWarning", false); // [FF67+]
// user_pref("browser.download.autohideButton", false); // [FF57+]
// user_pref("toolkit.cosmeticAnimations.enabled", false); // [FF55+]
// user_pref("toolkit.legacyUserProfileCustomizations.stylesheets", true); // [FF68+] allow userChrome/userContent
// 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.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 [WINDOWS] [MAC]
// 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]
// user_pref("browser.bookmarks.max_backups", 2);
// 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+]
// [SETTING] General>Browsing>Recommend features as you browse
// user_pref("identity.fxaccounts.enabled", false); // disable and hide Firefox Accounts and Sync [FF60+] [RESTART]
// user_pref("network.manage-offline-status", false); // see bugzilla 620472
// user_pref("reader.parse-on-load.enabled", false); // "Reader View"
// user_pref("xpinstall.signatures.required", false); // enforced extension signing (Nightly/ESR)
/*** [SECTION 9999]: DEPRECATED / REMOVED / LEGACY / RENAMED
Documentation denoted as [-]. Items deprecated prior to FF61 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
user_pref("_user.js.parrot", "9999 syntax error: the parrot's deprecated!");
/* ESR60.x still uses all the following prefs
// [NOTE] replace the * with a slash in the line above to re-enable them
// 0501: disable experiments
// [1] https://wiki.mozilla.org/Telemetry/Experiments
// [-] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1420908,1450801
user_pref("experiments.enabled", false);
user_pref("experiments.manifest.uri", "");
user_pref("experiments.supported", false);
user_pref("experiments.activeExperiment", false);
// 2612: disable remote JAR files being opened, regardless of content type [FF42+]
// [1] https://bugzilla.mozilla.org/1173171
// [2] https://www.fxsitecompat.com/en-CA/docs/2015/jar-protocol-support-has-been-disabled-by-default/
// [-] https://bugzilla.mozilla.org/1427726
user_pref("network.jar.block-remote-files", true);
// 2613: disable JAR from opening Unsafe File Types
// [-] https://bugzilla.mozilla.org/1427726
user_pref("network.jar.open-unsafe-types", false);
// 1803: disable Java plugin
// [-] (part5) https://bugzilla.mozilla.org/1461243
user_pref("plugin.state.java", 0);
// 0202: disable GeoIP-based search results
// [NOTE] May not be hidden if Firefox has changed your settings due to your locale
// [-] https://bugzilla.mozilla.org/1462015
user_pref("browser.search.countryCode", "US"); // [HIDDEN PREF]
// 0301a: disable auto-update checks for Firefox
// [SETTING] General>Firefox Updates>Never check for updates
// [-] https://bugzilla.mozilla.org/1420514
// user_pref("app.update.enabled", false);
// 0503: disable "Savant" Shield study [FF61+]
// [-] https://bugzilla.mozilla.org/1457226
user_pref("shield.savant.enabled", false);
// 1031: disable favicons in tabs and new bookmarks - merged into browser.chrome.site_icons
// [-] https://bugzilla.mozilla.org/1453751
// user_pref("browser.chrome.favicons", false);
// 2030: disable autoplay of HTML5 media - replaced by media.autoplay.default
// This may break video playback on various sites
// [-] https://bugzilla.mozilla.org/1470082
user_pref("media.autoplay.enabled", false);
// 2704: set cookie lifetime in days (see 2703)
// [-] https://bugzilla.mozilla.org/1457170
// user_pref("network.cookie.lifetime.days", 90); // [DEFAULT: 90]
// 5000's: enable "Ctrl+Tab cycles through tabs in recently used order" - replaced by browser.ctrlTab.recentlyUsedOrder
// [-] https://bugzilla.mozilla.org/1473595
// user_pref("browser.ctrlTab.previews", true);
// 0516: disable Onboarding [FF55+]
// Onboarding is an interactive tour/setup for new installs/profiles and features. Every time
// about:home or about:newtab is opened, the onboarding overlay is injected into that page
// [NOTE] Onboarding uses Google Analytics [2], and leaks resource://URIs [3]
// [1] https://wiki.mozilla.org/Firefox/Onboarding
// [2] https://github.com/mozilla/onboard/commit/db4d6c8726c89a5d6a241c1b1065827b525c5baf
// [3] https://bugzilla.mozilla.org/863246#c154
// [-] https://bugzilla.mozilla.org/1462415
user_pref("browser.onboarding.enabled", false);
// 2608: disable WebIDE ADB extension downloads - both renamed
// [1] https://trac.torproject.org/projects/tor/ticket/16222
// [-] https://bugzilla.mozilla.org/1491315
user_pref("devtools.webide.autoinstallADBHelper", false);
user_pref("devtools.webide.adbAddonURL", "");
// 2681: disable CSP violation events [FF59+]
// [1] https://developer.mozilla.org/docs/Web/API/SecurityPolicyViolationEvent
// [-] https://bugzilla.mozilla.org/1488165
user_pref("security.csp.enable_violation_events", false);
// 0850a: disable location bar autocomplete and suggestion types
// If you enforce any of the suggestion types (see the other 0850a), you MUST enforce 'autocomplete'
// - If *ALL* of the suggestion types are false, 'autocomplete' must also be false
// - If *ANY* of the suggestion types are true, 'autocomplete' must also be true
// [-] https://bugzilla.mozilla.org/1502392
user_pref("browser.urlbar.autocomplete.enabled", false);
// 0908: remove user & password info when attempting to fix an entered URL (i.e. 0802 is true)
// e.g. //user:password@foo -> //user@(prefix)foo(suffix) NOT //user:password@(prefix)foo(suffix)
// [-] https://bugzilla.mozilla.org/1510580
user_pref("browser.fixup.hide_user_pass", true); // [DEFAULT: true]
// 0380: disable Browser Error Reporter [FF60+]
// [1] https://support.mozilla.org/en-US/kb/firefox-nightly-error-collection
// [2] https://firefox-source-docs.mozilla.org/browser/browser/BrowserErrorReporter.html
// [-] https://bugzilla.mozilla.org/1509888
user_pref("browser.chrome.errorReporter.enabled", false);
user_pref("browser.chrome.errorReporter.submitUrl", "");
// 0502: disable Mozilla permission to silently opt you into tests
// [-] https://bugzilla.mozilla.org/1415625
user_pref("network.allow-experiments", false);
// 2428: enforce DOMHighResTimeStamp API
// [WARNING] Required for normalization of timestamps and any timer resolution mitigations
// [-] https://bugzilla.mozilla.org/1485264
user_pref("dom.event.highrestimestamp.enabled", true); // [DEFAULT: true]
// 5000's: disable CFR [FF64+] - split into two new prefs: *cfr.addons, *cfr.features
// [SETTING] General>Browsing>Recommend extensions as you browse
// [1] https://support.mozilla.org/en-US/kb/extension-recommendations
// [-] https://bugzilla.mozilla.org/1528953
// user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr", false);
// 0105b: disable Activity Stream Snippets
// [-] https://bugzilla.mozilla.org/1540939
user_pref("browser.aboutHomeSnippets.updateUrl", "");
user_pref("browser.newtabpage.activity-stream.disableSnippets", true);
// 0307: disable auto updating of lightweight themes (LWT)
// Not to be confused with themes in 0301* + 0302*, which use the FF55+ Theme API
// Mozilla plan to convert existing LWTs and remove LWT support in the future, see [1]
// [1] https://blog.mozilla.org/addons/2018/09/20/future-themes-here/
// [-] (part3b) https://bugzilla.mozilla.org/1525762
user_pref("lightweightThemes.update.enabled", false);
// 2682: enable CSP 1.1 experimental hash-source directive [FF29+]
// [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=855326,883975
// [-] https://bugzilla.mozilla.org/1386214
user_pref("security.csp.experimentalEnabled", true);
/* END: internal custom pref to test for syntax errors ***/
user_pref("_user.js.parrot", "SUCCESS: No no he's not dead, he's, he's restin'!");