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misc (#1040)

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* misc

- cleanup of old release notation in comments: e.g. if it's not applicable to ESR78+
- same with default version info
- simplify and save bytes on section 4700
- update 4500 header
  - and unify the message about using extensions as counterproductive
- letterboxing
   - provide info on stepped ranged (and drop crap about FF67)
   - don't judge users who dislike seeing margins (I don't like them either, but I force my window to exact dimensions and stay there)
- screenshots uploading was disabled in FF67+ : [67 release notes](https://www.mozilla.org/en-US/firefox/67.0/releasenotes/)
   - the pref is still there (default false) but so far I'm 99% sure this pref now does anything
   - I will add it to the scatchpad script if this change sticks

* simplify 4500 RFP, see #1041

* update removed script

* tidy readme, see #1045

- also put readme before releases

* RIP FX Site Compat

* clean out RFP Alts info: the information is redundant: it's already in the readme
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scratchpad-scripts/arkenfox-clear-removed.js
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@ -1,7 +1,7 @@
/*** /***
This will reset the preferences that have been removed completely from the arkenfox user.js. This will reset the preferences that have been removed completely from the arkenfox user.js.
Last updated: 2-Oct-2020 Last updated: 18-Oct-2020
For instructions see: For instructions see:
https://github.com/arkenfox/user.js/wiki/3.1-Resetting-Inactive-Prefs-[Scripts] https://github.com/arkenfox/user.js/wiki/3.1-Resetting-Inactive-Prefs-[Scripts]
@ -225,6 +225,10 @@
'browser.urlbar.usepreloadedtopurls.enabled', 'browser.urlbar.usepreloadedtopurls.enabled',
/* 80 */ /* 80 */
'dom.IntersectionObserver.enabled', 'dom.IntersectionObserver.enabled',
/* 82-beta */
'extensions.screenshots.upload-disabled',
'security.ssl3.dhe_rsa_aes_128_sha',
'security.ssl3.dhe_rsa_aes_256_sha',
/* reset parrot: check your open about:config after running the script */ /* reset parrot: check your open about:config after running the script */
'_user.js.parrot' '_user.js.parrot'
] ]

252
user.js
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@ -5,40 +5,34 @@
* url: https://github.com/arkenfox/user.js * url: https://github.com/arkenfox/user.js
* license: MIT: https://github.com/arkenfox/user.js/blob/master/LICENSE.txt * license: MIT: https://github.com/arkenfox/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/arkenfox/user.js/releases
* README: * README:
0. Consider using Tor Browser if it meets your needs or fits your threat model better 1. Consider using Tor Browser if it meets your needs or fits your threat model better
* https://www.torproject.org/about/torusers.html.en * https://www.torproject.org/about/torusers.html.en
1. READ the full README 2. Required reading: Overview, Backing Up, Implementing, and Maintenance entries
* https://github.com/arkenfox/user.js/blob/master/README.md * https://github.com/arkenfox/user.js/wiki
2. READ this 3. If you skipped step 2, return to step 2
* https://github.com/arkenfox/user.js/wiki/1.3-Implementation 4. Make changes
3. If you skipped steps 1 and 2 above (shame on you), then here is the absolute minimum * There are often trade-offs and conflicts between security vs privacy vs anti-fingerprinting
* Real time binary checks with Google services are disabled (0412) and these need to be balanced against functionality & convenience & breakage
* You will still get prompts to update Firefox, but auto-installing them is disabled (0302a) * Some site breakage and unintended consequences will happen. Everyone's experience will differ
* Some user data is erased on close (section 2800). Change this to suit your needs e.g. some user data is erased on close (section 2800), change this to suit your needs
* EACH RELEASE check: * While not 100% definitive, search for "[SETUP" tags
- 4600s: reset prefs made redundant due to privacy.resistFingerprinting (RPF) * Take the wiki link in step 2 and read the Troubleshooting entry
or enable them as an alternative to RFP (or some of them for ESR users) 5. Some tag info
- 9999s: reset deprecated prefs in about:config or enable the relevant section for ESR
* Site breakage WILL happen
- There are often trade-offs and conflicts between Security vs Privacy vs Anti-Fingerprinting
and these need to be balanced against Functionality & Convenience & Breakage
* You will need to make changes, and to troubleshoot at times (choose wisely, there is always a trade-off).
While not 100% definitive, search for "[SETUP". If required, add each pref to your overrides section at
default values (or comment them out and reset them in about:config). Here are the main ones:
[SETUP-SECURITY] it's one item, read it [SETUP-SECURITY] it's one item, read it
[SETUP-WEB] can cause some websites to break [SETUP-WEB] can cause some websites to break
[SETUP-CHROME] changes how Firefox itself behaves (i.e. NOT directly website related) [SETUP-CHROME] changes how Firefox itself behaves (i.e. not directly website related)
[SETUP-PERF] may impact performance [SETUP-PERF] may impact performance
[SETUP-HARDEN] maybe you should consider using the Tor Browser [WARNING] used sparingly, heed them
* [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) * RELEASES
5. KEEP UP TO DATE: https://github.com/arkenfox/user.js/wiki#small_orange_diamond-maintenance
* Archive: https://github.com/arkenfox/user.js/releases
* Use the correct release that matches your Firefox version
* Each release
- run the prefsCleaner or reset deprecated prefs (9999s) and prefs made redundant by RFP (4600s)
- re-enable section 4600 if you don't use RFP
* INDEX: * INDEX:
@ -68,7 +62,7 @@
4000: FPI (FIRST PARTY ISOLATION) 4000: FPI (FIRST PARTY ISOLATION)
4500: RFP (RESIST FINGERPRINTING) 4500: RFP (RESIST FINGERPRINTING)
4600: RFP ALTERNATIVES 4600: RFP ALTERNATIVES
4700: RFP ALTERNATIVES (NAVIGATOR / USER AGENT (UA) SPOOFING) 4700: RFP ALTERNATIVES (USER AGENT SPOOFING)
5000: PERSONAL 5000: PERSONAL
9999: DEPRECATED / REMOVED / LEGACY / RENAMED 9999: DEPRECATED / REMOVED / LEGACY / RENAMED
@ -340,10 +334,8 @@ user_pref("extensions.systemAddon.update.url", ""); // [FF44+]
/* 0506: disable PingCentre telemetry (used in several System Add-ons) [FF57+] /* 0506: disable PingCentre telemetry (used in several System Add-ons) [FF57+]
* Currently blocked by 'datareporting.healthreport.uploadEnabled' (see 0340) ***/ * Currently blocked by 'datareporting.healthreport.uploadEnabled' (see 0340) ***/
user_pref("browser.ping-centre.telemetry", false); user_pref("browser.ping-centre.telemetry", false);
/* 0515: disable Screenshots /* 0515: disable Screenshots ***/
* alternatively in FF60+, disable uploading to the Screenshots server ***/
// user_pref("extensions.screenshots.disabled", true); // [FF55+] // user_pref("extensions.screenshots.disabled", true); // [FF55+]
// user_pref("extensions.screenshots.upload-disabled", true); // [FF60+]
/* 0517: disable Form Autofill /* 0517: disable Form Autofill
* [NOTE] Stored data is NOT secure (uses a JSON file) * [NOTE] Stored data is NOT secure (uses a JSON file)
* [NOTE] Heuristics controls Form Autofill on forms without @autocomplete attributes * [NOTE] Heuristics controls Form Autofill on forms without @autocomplete attributes
@ -365,7 +357,7 @@ user_pref("network.prefetch-next", false);
/* 0602: disable DNS prefetching /* 0602: disable DNS prefetching
* [1] https://developer.mozilla.org/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control ***/ * [1] https://developer.mozilla.org/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control ***/
user_pref("network.dns.disablePrefetch", true); user_pref("network.dns.disablePrefetch", true);
user_pref("network.dns.disablePrefetchFromHTTPS", true); // [DEFAULT: true FF70+] user_pref("network.dns.disablePrefetchFromHTTPS", true); // [DEFAULT: true]
/* 0603: disable predictor / prefetching ***/ /* 0603: disable predictor / prefetching ***/
user_pref("network.predictor.enabled", false); user_pref("network.predictor.enabled", false);
user_pref("network.predictor.enable-prefetch", false); // [FF48+] user_pref("network.predictor.enable-prefetch", false); // [FF48+]
@ -417,8 +409,7 @@ user_pref("network.http.altsvc.oe", false);
* as a remote Tor node will handle the DNS request * as a remote Tor node will handle the DNS request
* [1] https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO/WebBrowsers ***/ * [1] https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO/WebBrowsers ***/
user_pref("network.proxy.socks_remote_dns", true); user_pref("network.proxy.socks_remote_dns", true);
/* 0708: disable FTP [FF60+] /* 0708: disable FTP [FF60+] ***/
* [1] https://www.fxsitecompat.dev/en-CA/docs/2020/ftp-support-will-be-removed/ ***/
// user_pref("network.ftp.enabled", false); // user_pref("network.ftp.enabled", false);
/* 0709: disable using UNC (Uniform Naming Convention) paths [FF61+] /* 0709: disable using UNC (Uniform Naming Convention) paths [FF61+]
* [SETUP-CHROME] Can break extensions for profiles on network shares * [SETUP-CHROME] Can break extensions for profiles on network shares
@ -546,8 +537,7 @@ user_pref("signon.formlessCapture.enabled", false);
* hardens against potential credentials phishing * hardens against potential credentials phishing
* 0=don't allow sub-resources to open HTTP authentication credentials dialogs * 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 * 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) * 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); user_pref("network.auth.subresource-http-auth-allow", 1);
/*** [SECTION 1000]: CACHE / SESSION (RE)STORE / FAVICONS /*** [SECTION 1000]: CACHE / SESSION (RE)STORE / FAVICONS
@ -648,7 +638,7 @@ user_pref("security.ssl.require_safe_negotiation", true);
* [STATS] Firefox telemetry (June 2020) shows only 0.16% of SSL handshakes use 1.0 or 1.1 * [STATS] Firefox telemetry (June 2020) shows only 0.16% of SSL handshakes use 1.0 or 1.1
* [WARNING] Leave these at default, otherwise you alter your TLS fingerprint. * [WARNING] Leave these at default, otherwise you alter your TLS fingerprint.
* [1] https://www.ssllabs.com/ssl-pulse/ ***/ * [1] https://www.ssllabs.com/ssl-pulse/ ***/
// user_pref("security.tls.version.min", 3); // [DEFAULT: 3 FF78+] // user_pref("security.tls.version.min", 3); // [DEFAULT: 3]
// user_pref("security.tls.version.max", 4); // user_pref("security.tls.version.max", 4);
/* 1203: enforce TLS 1.0 and 1.1 downgrades as session only */ /* 1203: enforce TLS 1.0 and 1.1 downgrades as session only */
user_pref("security.tls.version.enable-deprecated", false); user_pref("security.tls.version.enable-deprecated", false);
@ -753,10 +743,6 @@ user_pref("security.mixed_content.block_object_subrequest", true);
* [2] https://en.wikipedia.org/wiki/Meet-in-the-middle_attack * [2] https://en.wikipedia.org/wiki/Meet-in-the-middle_attack
* [3] https://www-archive.mozilla.org/projects/security/pki/nss/ssl/fips-ssl-ciphersuites.html ***/ * [3] https://www-archive.mozilla.org/projects/security/pki/nss/ssl/fips-ssl-ciphersuites.html ***/
// user_pref("security.ssl3.rsa_des_ede3_sha", false); // user_pref("security.ssl3.rsa_des_ede3_sha", false);
/* 1263: disable DHE (Diffie-Hellman Key Exchange)
* [1] https://www.eff.org/deeplinks/2015/10/how-to-protect-yourself-from-nsa-attacks-1024-bit-DH ***/
// user_pref("security.ssl3.dhe_rsa_aes_128_sha", false); // [DEFAULT: false FF78+]
// user_pref("security.ssl3.dhe_rsa_aes_256_sha", false); // [DEFAULT: false FF78+]
/* 1264: disable the remaining non-modern cipher suites as of FF78 (in order of preferred by FF) ***/ /* 1264: disable the remaining non-modern cipher suites as of FF78 (in order of preferred by FF) ***/
// user_pref("security.ssl3.ecdhe_ecdsa_aes_256_sha", false); // user_pref("security.ssl3.ecdhe_ecdsa_aes_256_sha", false);
// user_pref("security.ssl3.ecdhe_ecdsa_aes_128_sha", false); // user_pref("security.ssl3.ecdhe_ecdsa_aes_128_sha", false);
@ -783,7 +769,7 @@ user_pref("browser.ssl_override_behavior", 1);
* [TEST] https://expired.badssl.com/ ***/ * [TEST] https://expired.badssl.com/ ***/
user_pref("browser.xul.error_pages.expert_bad_cert", true); user_pref("browser.xul.error_pages.expert_bad_cert", true);
/* 1273: display "insecure" icon and "Not Secure" text on HTTP sites ***/ /* 1273: display "insecure" icon and "Not Secure" text on HTTP sites ***/
// user_pref("security.insecure_connection_icon.enabled", true); // [FF59+] [DEFAULT: true FF70+] // user_pref("security.insecure_connection_icon.enabled", true); // [FF59+] [DEFAULT: true]
user_pref("security.insecure_connection_text.enabled", true); // [FF60+] user_pref("security.insecure_connection_text.enabled", true); // [FF60+]
/*** [SECTION 1400]: FONTS ***/ /*** [SECTION 1400]: FONTS ***/
@ -819,9 +805,7 @@ user_pref("gfx.font_rendering.graphite.enabled", false);
harden it a bit: set XOriginPolicy (1603) to 1 (as per the settings below) 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 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: If you want any REAL control over referers and breakage, then use an extension
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 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+path: https://example.com:8888/foo/bar.html
@ -981,9 +965,6 @@ user_pref("dom.popup_allowed_events", "click dblclick");
including service and shared workers. Shared workers can be utilized by multiple scripts and 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. 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 [1] Web Workers: https://developer.mozilla.org/docs/Web/API/Web_Workers_API
[2] Worker: https://developer.mozilla.org/docs/Web/API/Worker [2] Worker: https://developer.mozilla.org/docs/Web/API/Worker
[3] Service Worker: https://developer.mozilla.org/docs/Web/API/Service_Worker_API [3] Service Worker: https://developer.mozilla.org/docs/Web/API/Service_Worker_API
@ -1065,7 +1046,6 @@ user_pref("javascript.options.asmjs", false);
// user_pref("javascript.options.baselinejit", false); // user_pref("javascript.options.baselinejit", false);
// user_pref("javascript.options.jit_trustedprincipals", true); // [FF75+] [HIDDEN PREF] // user_pref("javascript.options.jit_trustedprincipals", true); // [FF75+] [HIDDEN PREF]
/* 2422: disable WebAssembly [FF52+] [SETUP-PERF] /* 2422: disable WebAssembly [FF52+] [SETUP-PERF]
* [NOTE] In FF71+ this no longer affects extensions (1576254)
* [1] https://developer.mozilla.org/docs/WebAssembly ***/ * [1] https://developer.mozilla.org/docs/WebAssembly ***/
user_pref("javascript.options.wasm", false); user_pref("javascript.options.wasm", false);
/* 2429: enable (limited but sufficient) window.opener protection [FF65+] /* 2429: enable (limited but sufficient) window.opener protection [FF65+]
@ -1250,14 +1230,13 @@ user_pref("security.dialog_enable_delay", 700);
user_pref("_user.js.parrot", "2700 syntax error: the parrot's joined the bleedin' choir invisible!"); 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] /* 2701: disable 3rd-party cookies and site-data [SETUP-WEB]
* 0=Accept cookies and site data, 1=(Block) All third-party cookies, 2=(Block) All cookies, * 0=Accept cookies and site data, 1=(Block) All third-party cookies, 2=(Block) All cookies,
* 3=(Block) Cookies from unvisited websites, 4=(Block) Cross-site and social media trackers (FF63+) (default FF69+) * 3=(Block) Cookies from unvisited websites, 4=(Block) Cross-site and social media trackers (default)
* [NOTE] You can set exceptions under site permissions or use an extension * [NOTE] You can set exceptions under site permissions or use an extension
* [NOTE] Enforcing category to custom ensures ETP related prefs are always honored * [NOTE] Enforcing category to custom ensures ETP related prefs are always honored
* [SETTING] Privacy & Security>Enhanced Tracking Protection>Custom>Cookies ***/ * [SETTING] Privacy & Security>Enhanced Tracking Protection>Custom>Cookies ***/
user_pref("network.cookie.cookieBehavior", 1); user_pref("network.cookie.cookieBehavior", 1);
user_pref("browser.contentblocking.category", "custom"); user_pref("browser.contentblocking.category", "custom");
/* 2702: set third-party cookies (i.e ALL) (if enabled, see 2701) to session-only /* 2702: set third-party cookies (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 [NOTE] .sessionOnly overrides .nonsecureSessionOnly except when .sessionOnly=false and
.nonsecureSessionOnly=true. This allows you to keep HTTPS cookies, but session-only HTTP ones .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/ ***/ * [1] https://feeding.cloud.geek.nz/posts/tweaking-cookies-for-privacy-in-firefox/ ***/
@ -1388,72 +1367,67 @@ user_pref("privacy.firstparty.isolate", true);
user_pref("privacy.partition.network_state", true); user_pref("privacy.partition.network_state", true);
/*** [SECTION 4500]: RFP (RESIST FINGERPRINTING) /*** [SECTION 4500]: RFP (RESIST FINGERPRINTING)
This master switch will be used for a wide range of items, many of which will RFP covers a wide range of ongoing fingerprinting solutions.
**override** existing prefs from FF55+, often providing a **better** solution It is an all-or-nothing buy in: you cannot pick and choose what parts you want
IMPORTANT: As existing prefs become redundant, and some of them WILL interfere [WARNING] Do NOT use extensions to alter RFP protected metrics
with how RFP works, they will be moved to section 4600 and made inactive [WARNING] Do NOT use prefs in section 4600 with RFP as they can interfere
** 418986 - limit window.screen & CSS media queries leaking identifiable info (FF41+) FF41+
[NOTE] Info only: To set a size, open a XUL (chrome) page (such as about:config) which is at 418986 - limit window.screen & CSS media queries leaking identifiable info
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://arkenfox.github.io/TZP/tzp.html#screen [TEST] https://arkenfox.github.io/TZP/tzp.html#screen
** 1281949 - spoof screen orientation (FF50+) FF50+
** 1281963 - hide the contents of navigator.plugins and navigator.mimeTypes (FF50+) 1281949 - spoof screen orientation
FF53: Fixes GetSupportedNames in nsMimeTypeArray and nsPluginArray (1324044) 1281963 - hide the contents of navigator.plugins and navigator.mimeTypes (FF50+)
** 1330890 - spoof timezone as UTC 0 (FF55+) FF55+
FF58: Date.toLocaleFormat deprecated (818634) 1330890 - spoof timezone as UTC 0
FF60: Date.toLocaleDateString and Intl.DateTimeFormat fixed (1409973) 1360039 - spoof navigator.hardwareConcurrency as 2 (see 4601)
** 1360039 - spoof navigator.hardwareConcurrency as 2 (see 4601) (FF55+) 1217238 - reduce precision of time exposed by javascript
This spoof *shouldn't* affect core chrome/Firefox performance FF56+
** 1217238 - reduce precision of time exposed by javascript (FF55+) 1369303 - spoof/disable performance API (see 4602, 4603)
** 1369303 - spoof/disable performance API (see 2410-deprecated, 4602, 4603) (FF56+) 1333651 - spoof User Agent & Navigator API (see section 4700)
** 1333651 & 1383495 & 1396468 - spoof User Agent & Navigator API (see section 4700) (FF56+) JS: FF78+ the version is spoofed as 78, and the OS as Windows 10, OS 10.15, Android 9, or Linux
FF56: Version: rounded down to the nearest multiple of 10 HTTP Headers: spoofed as Windows or Android
FF57: Version: match current ESR (1393283, 1418672, 1418162, 1511763) 1369319 - disable device sensor API (see 4604)
FF59: OS: Windows, OSX, Android, or Linux (to reduce breakage) (1404608) 1369357 - disable site specific zoom (see 4605)
FF66: OS: HTTP Headers reduced to Windows or Android (1509829) 1337161 - hide gamepads from content (see 4606)
FF68: OS: updated to Windows 10, OS 10.14, and Android 8.1 (1511434) 1372072 - spoof network information API as "unknown" when dom.netinfo.enabled = true (see 4607)
FF78: OS: updated to OS 10.15 and Android 9.0 (1635011) 1333641 - reduce fingerprinting in WebSpeech API (see 4608)
** 1369319 - disable device sensor API (see 4604) (FF56+) FF57+
** 1369357 - disable site specific zoom (see 4605) (FF56+) 1369309 - spoof media statistics (see 4610)
** 1337161 - hide gamepads from content (see 4606) (FF56+) 1382499 - reduce screen co-ordinate fingerprinting in Touch API (see 4611)
** 1372072 - spoof network information API as "unknown" when dom.netinfo.enabled = true (see 4607) (FF56+) 1217290 & 1409677 - enable fingerprinting resistance for WebGL (see 2010-12)
** 1333641 - reduce fingerprinting in WebSpeech API (see 4608) (FF56+) 1382545 - reduce fingerprinting in Animation API
** 1372069 & 1403813 & 1441295 - block geolocation requests (same as denying a site permission) (see 0201, 0202) (FF56-62) 1354633 - limit MediaError.message to a whitelist
** 1369309 - spoof media statistics (see 4610) (FF57+) 1382533 - enable fingerprinting resistance for Presentation API
** 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) This blocks exposure of local IP Addresses via mDNS (Multicast DNS)
** 967895 - spoof canvas and enable site permission prompt before allowing canvas data extraction (FF58+) FF58+
FF59: Added to site permissions panel (1413780) Only prompt when triggered by user input (1376865) 967895 - spoof canvas and enable site permission prompt before allowing canvas data extraction
** 1372073 - spoof/block fingerprinting in MediaDevices API (FF59+) FF59+
1372073 - spoof/block fingerprinting in MediaDevices API
Spoof: enumerate devices reports one "Internal Camera" and one "Internal Microphone" if 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) media.navigator.enabled is true (see 2505 which we chose to keep disabled)
Block: suppresses the ondevicechange event (see 4612) Block: suppresses the ondevicechange event (see 4612)
** 1039069 - warn when language prefs are set to non en-US (see 0210, 0211) (FF59+) 1039069 - warn when language prefs are set to non en-US (see 0210, 0211)
** 1222285 & 1433592 - spoof keyboard events and suppress keyboard modifier events (FF59+) 1222285 & 1433592 - spoof keyboard events and suppress keyboard modifier events
Spoofing mimics the content language of the document. Currently it only supports en-US. 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. Modifier events suppressed are SHIFT and both ALT keys. Chrome is not affected.
FF60: Fix keydown/keyup events (1438795) FF60-67
** 1337157 - disable WebGL debug renderer info (see 4613) (FF60+) 1337157 - disable WebGL debug renderer info (see 4613) (FF60+)
** 1459089 - disable OS locale in HTTP Accept-Language headers (ANDROID) (FF62+) 1459089 - disable OS locale in HTTP Accept-Language headers (ANDROID) (FF62+)
** 1479239 - return "no-preference" with prefers-reduced-motion (see 4614) (FF63+) 1479239 - return "no-preference" with prefers-reduced-motion (see 4614) (FF63+)
** 1363508 - spoof/suppress Pointer Events (see 4615) (FF64+) 1363508 - spoof/suppress Pointer Events (see 4615) (FF64+)
FF65: pointerEvent.pointerid (1492766) FF65: pointerEvent.pointerid (1492766)
** 1485266 - disable exposure of system colors to CSS or canvas (see 4616) (FF67+) 1485266 - disable exposure of system colors to CSS or canvas (see 4616) (FF67+)
** 1407366 - enable inner window letterboxing (see 4504) (FF67+) 1407366 - enable inner window letterboxing (see 4504) (FF67+)
** 1494034 - return "light" with prefers-color-scheme (see 4617) (FF67+) 1494034 - return "light" with prefers-color-scheme (see 4617) (FF67+)
[1] https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme FF68-77
** 1564422 - spoof audioContext outputLatency (FF70+) 1564422 - spoof audioContext outputLatency (FF70+)
** 1595823 - spoof audioContext sampleRate (FF72+) 1595823 - spoof audioContext sampleRate (FF72+)
** 1607316 - spoof pointer as coarse and hover as none (ANDROID) (FF74+) 1607316 - spoof pointer as coarse and hover as none (ANDROID) (FF74+)
** 1621433 - randomize canvas (previously FF58+ returned an all-white canvas) (FF78+) FF78+
** 1653987 - limit font visibility to bundled and "Base Fonts" (see 4618) (non-ANDROID) (FF80+) 1621433 - randomize canvas (previously FF58+ returned an all-white canvas) (FF78+)
1653987 - limit font visibility to bundled and "Base Fonts" (see 4618) (non-ANDROID) (FF80+)
***/ ***/
user_pref("_user.js.parrot", "4500 syntax error: the parrot's popped 'is clogs"); user_pref("_user.js.parrot", "4500 syntax error: the parrot's popped 'is clogs");
/* 4501: enable privacy.resistFingerprinting [FF41+] /* 4501: enable privacy.resistFingerprinting [FF41+]
@ -1470,22 +1444,22 @@ user_pref("privacy.resistFingerprinting", true);
// user_pref("privacy.window.maxInnerWidth", 1000); // user_pref("privacy.window.maxInnerWidth", 1000);
// user_pref("privacy.window.maxInnerHeight", 1000); // user_pref("privacy.window.maxInnerHeight", 1000);
/* 4503: disable mozAddonManager Web API [FF57+] /* 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 * [NOTE] To allow extensions to work on AMO, you also need 2662
* 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 ***/ * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1384330,1406795,1415644,1453988 ***/
user_pref("privacy.resistFingerprinting.block_mozAddonManager", true); // [HIDDEN PREF] user_pref("privacy.resistFingerprinting.block_mozAddonManager", true); // [HIDDEN PREF]
/* 4504: enable RFP letterboxing [FF67+] /* 4504: enable RFP letterboxing [FF67+]
* Dynamically resizes the inner window (FF67; 200w x100h: FF68+; stepped ranges) by applying letterboxing, * Dynamically resizes the inner window by applying margins in stepped ranges, see [2]
* using dimensions which waste the least content area, If you use the dimension pref, then it will only apply * If you use the dimension pref, then it will only apply those resolutions. The format is
* those resolutions. The format is "width1xheight1, width2xheight2, ..." (e.g. "800x600, 1000x1000, 1600x900") * "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 * [SETUP-WEB] This does NOT require RFP (see 4501) **for now**, so if you're not using 4501, or you are but
* not taking anti-fingerprinting seriously and a little visual change upsets you, then feel free to flip this pref * dislike margins being applied, then flip this pref, keeping in mind that it is effectively fingerprintable
* [WARNING] The dimension pref is only meant for testing, and we recommend you DO NOT USE it * [WARNING] The dimension pref is only meant for testing, and we recommend you DO NOT USE it
* [1] https://bugzilla.mozilla.org/1407366 ***/ * [1] https://bugzilla.mozilla.org/1407366
* [2] https://hg.mozilla.org/mozilla-central/rev/6d2d7856e468#l2.32 ***/
user_pref("privacy.resistFingerprinting.letterboxing", true); // [HIDDEN PREF] user_pref("privacy.resistFingerprinting.letterboxing", true); // [HIDDEN PREF]
// user_pref("privacy.resistFingerprinting.letterboxing.dimensions", ""); // [HIDDEN PREF] // user_pref("privacy.resistFingerprinting.letterboxing.dimensions", ""); // [HIDDEN PREF]
/* 4510: disable showing about:blank as soon as possible during startup [FF60+] /* 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 * When default true this no longer masks the RFP chrome resizing activity
* [1] https://bugzilla.mozilla.org/1448423 ***/ * [1] https://bugzilla.mozilla.org/1448423 ***/
user_pref("browser.startup.blankWindow", false); user_pref("browser.startup.blankWindow", false);
/* 4520: disable chrome animations [FF77+] [RESTART] /* 4520: disable chrome animations [FF77+] [RESTART]
@ -1493,15 +1467,7 @@ user_pref("browser.startup.blankWindow", false);
user_pref("ui.prefersReducedMotion", 1); // [HIDDEN PREF] user_pref("ui.prefersReducedMotion", 1); // [HIDDEN PREF]
/*** [SECTION 4600]: RFP ALTERNATIVES /*** [SECTION 4600]: RFP ALTERNATIVES
* non-RFP users: [WARNING] Do NOT use prefs in this section with RFP as they can interfere
Enable the whole section (see the SETUP tag below)
* RFP users:
Make sure these are reset in about:config. They are redundant. In fact, some
even cause RFP to not behave as you would expect and alter your fingerprint
* ESR RFP users:
Reset those *up to and including* your version. Add those *after* your version
as active prefs in your overrides. This is assuming that the patch wasn't also
backported to Firefox ESR. Backporting RFP patches to ESR is rare.
***/ ***/
user_pref("_user.js.parrot", "4600 syntax error: the parrot's crossed the Jordan"); 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 /* [SETUP-non-RFP] Non-RFP users replace the * with a slash on this line to enable these
@ -1600,32 +1566,22 @@ user_pref("layout.css.font-visibility.level", 1);
// * * * / // * * * /
// ***/ // ***/
/*** [SECTION 4700]: RFP ALTERNATIVES (NAVIGATOR / USER AGENT (UA) SPOOFING) /*** [SECTION 4700]: RFP ALTERNATIVES (USER AGENT SPOOFING)
This is FYI ONLY. These prefs are INSUFFICIENT(a) on their own, you need These prefs are insufficient and leak. Use RFP and **nothing else**
to use RFP (4500) or an extension, in which case they become POINTLESS. - Many of the user agent components can be derived by other means. When those
(a) Many of the components that make up your UA can be derived by other means. values differ, you provide more bits and raise entropy. Examples include
And when those values differ, you provide more bits and raise entropy. workers, iframes, headers, tcp/ip attributes, feature detection, and many more
Examples of leaks include workers, navigator objects, date locale/formats, - Web extensions also lack APIs to fully protect spoofing
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"); user_pref("_user.js.parrot", "4700 syntax error: the parrot's taken 'is last bow");
/* 4701: navigator.userAgent ***/ /* 4701: navigator DOM object overrides
// user_pref("general.useragent.override", ""); // [HIDDEN PREF] * [WARNING] DO NOT USE ***/
/* 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] // user_pref("general.appname.override", ""); // [HIDDEN PREF]
/* 4704: navigator.appVersion ***/
// user_pref("general.appversion.override", ""); // [HIDDEN PREF] // user_pref("general.appversion.override", ""); // [HIDDEN PREF]
/* 4705: navigator.platform ***/ // user_pref("general.buildID.override", ""); // [HIDDEN PREF]
// user_pref("general.platform.override", ""); // [HIDDEN PREF]
/* 4706: navigator.oscpu ***/
// user_pref("general.oscpu.override", ""); // [HIDDEN PREF] // user_pref("general.oscpu.override", ""); // [HIDDEN PREF]
// user_pref("general.platform.override", ""); // [HIDDEN PREF]
// user_pref("general.useragent.override", ""); // [HIDDEN PREF]
/*** [SECTION 5000]: PERSONAL /*** [SECTION 5000]: PERSONAL
Non-project related but useful. If any of these interest you, add them to your overrides ***/ Non-project related but useful. If any of these interest you, add them to your overrides ***/