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21 Commits

Author SHA1 Message Date
c5087d6522 tidy 2025-08-25 11:25:44 +00:00
ff92cee8f0 update FPP info 2025-08-24 05:03:28 +00:00
934a339e41 add removed OCSP prefs to cleanup script 2025-08-20 16:10:56 +00:00
ae6242bded remove OCSP, #1576 2025-08-20 16:01:10 +00:00
9ad1ce561f v142 2025-08-19 10:49:32 +00:00
9103afafff deprecated FF140 2025-08-13 18:29:19 +00:00
9e8ead84c8 v140 (#1945) 2025-08-13 18:27:04 +00:00
7f852e94fc media.ondevicechange.enabled 2025-04-21 15:04:04 +00:00
3d76c74c80 v135 (#1929) 2025-03-06 02:52:08 +00:00
9bba5788aa legacy sanitizing prefs
In FF128 these were used to migrate to
- clearOnShutdown to clearOnShutdown_v2
- cpd to clearHistory

They are then no longer used.

The migration can be checked with
- privacy.sanitize.clearOnShutdown.hasMigratedToNewPrefs2
- privacy.sanitize.cpd.hasMigratedToNewPrefs2

Note: in FF136 there was another migration, where it changes the `ToNewPrefs2` to false
- privacy.sanitize.clearOnShutdown.hasMigratedToNewPrefs3
- privacy.sanitize.cpd.hasMigratedToNewPrefs3

AFAICT, cpd.hasMigrated* doesn't migrate until you open the clear history dialog.
2025-03-05 07:21:39 +00:00
c25187332e fix the year 2025-01-12 19:02:07 +00:00
80fa110f49 dom.securecontext.allowlist_onions 2025-01-12 19:01:32 +00:00
b8f18a3d91 v133 (#1892) 2025-01-12 15:49:26 +00:00
eae5762d29 Add missing -command argument in powershell call (#1909)
* updater: add missing PowerShell argument

* prefcleaner: add missing PowerShell argument
2024-11-09 12:55:49 +00:00
c6cfa10c0b webchannel.allowObject.urlWhitelist 2024-11-07 09:50:47 +00:00
bc6a2ba145 network.http.referer.hideOnionSource
since it was flipped to true for TB, not much point keeping it
2024-11-06 15:24:03 +00:00
f906f7f3b4 v128 (#1862) 2024-08-26 08:41:28 +00:00
11582f905a geo.provider.use_gpsd
https://bugzilla.mozilla.org/show_bug.cgi?id=1803234 - removed in FF131

and it doesn't work: https://bugzilla.mozilla.org/show_bug.cgi?id=1763347
2024-08-06 04:37:00 +00:00
ff5c959cb9 geo.provider* 2024-07-09 05:49:23 +00:00
23caf69614 v127 deprecated 2024-06-22 15:44:54 +00:00
6446d73cf5 add deprecated since FF119 2024-06-14 06:14:26 +00:00
4 changed files with 290 additions and 268 deletions

View File

@ -3,7 +3,7 @@ TITLE prefs.js cleaner
REM ### prefs.js cleaner for Windows
REM ## author: @claustromaniac
REM ## version: 2.7
REM ## version: 2.8
CD /D "%~dp0"
@ -15,7 +15,7 @@ ECHO:
ECHO ########################################
ECHO #### prefs.js cleaner for Windows ####
ECHO #### by claustromaniac ####
ECHO #### v2.7 ####
ECHO #### v2.8 ####
ECHO ########################################
ECHO:
CALL :message "This script should be run from your Firefox profile directory."
@ -37,7 +37,7 @@ CALL :strlenCheck
CALL :FFcheck
CALL :message "Backing up prefs.js..."
FOR /F "delims=" %%# IN ('powershell get-date -format "{yyyyMMdd_HHmmss}"') DO @SET ldt=%%#
FOR /F "delims=" %%# IN ('powershell -command get-date -format "{yyyyMMdd_HHmmss}"') DO @SET ldt=%%#
COPY /B /V /Y prefs.js "prefs-backup-%ldt%.js"
CALL :message "Cleaning prefs.js..."

View File

@ -6,7 +6,7 @@
There is an archived version at https://github.com/arkenfox/user.js/issues/123
if you want the full list since jesus
Last updated: 2-November-2023
Last updated: 20-August-2025
Instructions:
- [optional] close Firefox and backup your profile
@ -35,7 +35,15 @@
const aPREFS = [
/* DEPRECATED */
/* 129-140 */
'browser.shopping.experience2023.enabled', // 140
'browser.urlbar.pocket.featureGate', // 140
'media.ondevicechange.enabled', // 137
'webchannel.allowObject.urlWhitelist', // 132
/* 116-128 */
'browser.contentanalysis.default_allow', // 127
'browser.messaging-system.whatsNewPanel.enabled', // 126
'browser.ping-centre.telemetry', // 123
'dom.webnotifications.serviceworker.enabled', // 117
'javascript.use_us_english_locale', // 119
'layout.css.font-visibility.private', // 118
@ -45,6 +53,7 @@
'network.dns.skipTRR-when-parental-control-enabled', // 119
'permissions.delegation.enabled', // 118
'security.family_safety.mode', // 117
'widget.non-native-theme.enabled', // 127
/* 103-115 */
'browser.cache.offline.enable', // 115
'extensions.formautofill.heuristics.enabled', // 114
@ -67,10 +76,32 @@
'security.ssl3.rsa_des_ede3_sha', // 93
/* REMOVED */
/* 141-153 */
'security.OCSP.enabled',
'security.OCSP.require',
/* 129-140 */
'dom.securecontext.allowlist_onions',
'network.http.referer.hideOnionSource',
'privacy.clearOnShutdown.cache',
'privacy.clearOnShutdown.cookies',
'privacy.clearOnShutdown.downloads',
'privacy.clearOnShutdown.formdata',
'privacy.clearOnShutdown.history',
'privacy.clearOnShutdown.offlineApps',
'privacy.clearOnShutdown.sessions',
'privacy.cpd.cache',
'privacy.cpd.cookies',
'privacy.cpd.formdata',
'privacy.cpd.history',
'privacy.cpd.offlineApps',
'privacy.cpd.sessions',
/* 116-128 */
'browser.fixup.alternate.enabled',
'browser.taskbar.previews.enable',
'browser.urlbar.dnsResolveSingleWordsAfterSearch',
'geo.provider.network.url',
'geo.provider.network.logging.enabled',
'geo.provider.use_gpsd',
'media.gmp-widevinecdm.enabled',
'network.protocol-handler.external.ms-windows-store',
'privacy.partition.always_partition_third_party_non_cookie_storage',

View File

@ -3,7 +3,7 @@ TITLE arkenfox user.js updater
REM ## arkenfox user.js updater for Windows
REM ## author: @claustromaniac
REM ## version: 4.19
REM ## version: 4.20
REM ## instructions: https://github.com/arkenfox/user.js/wiki/5.1-Updater-[Options]#-windows
SET v=4.19
@ -177,7 +177,7 @@ IF EXIST user.js.new (
IF DEFINED _singlebackup (
MOVE /Y user.js user.js.bak >nul
) ELSE (
FOR /F "delims=" %%# IN ('powershell get-date -format "{yyyyMMdd_HHmmss}"') DO @SET ldt=%%#
FOR /F "delims=" %%# IN ('powershell -command get-date -format "{yyyyMMdd_HHmmss}"') DO @SET ldt=%%#
MOVE /Y user.js "user-backup-!ldt!.js" >nul
)
REN user.js.new user.js

515
user.js
View File

@ -1,7 +1,7 @@
/******
* name: arkenfox user.js
* date: 7 June 2024
* version: 126
* date: 15 September 2025
* version: 142
* urls: https://github.com/arkenfox/user.js [repo]
* : https://arkenfox.github.io/gui/ [interactive]
* license: MIT: https://github.com/arkenfox/user.js/blob/master/LICENSE.txt
@ -31,7 +31,7 @@
- DON'T wait for arkenfox to update Firefox, nothing major changes these days
* Each release
- run prefsCleaner to reset prefs made inactive, including deprecated (9999)
* ESR
* ESR (Extended Support Release)
- It is recommended to not use the updater, or you will get a later version which may cause issues.
So you should manually append your overrides (and keep a copy), and manually update when you
change ESR releases (arkenfox is already past that release)
@ -57,12 +57,13 @@
2700: ETP (ENHANCED TRACKING PROTECTION)
2800: SHUTDOWN & SANITIZING
4000: FPP (fingerprintingProtection)
4500: RFP (resistFingerprinting)
4500: OPTIONAL RFP (resistFingerprinting)
5000: OPTIONAL OPSEC
5500: OPTIONAL HARDENING
6000: DON'T TOUCH
7000: DON'T BOTHER
8000: DON'T BOTHER: FINGERPRINTING
8500: TELEMETRY
9000: NON-PROJECT RELATED
9999: DEPRECATED / RENAMED
@ -82,35 +83,31 @@ user_pref("browser.aboutConfig.showWarning", false);
user_pref("_user.js.parrot", "0100 syntax error: the parrot's dead!");
/* 0102: set startup page [SETUP-CHROME]
* 0=blank, 1=home, 2=last visited page, 3=resume previous session
* [NOTE] Session Restore is cleared with history (2811), and not used in Private Browsing mode
* [NOTE] Session Restore is cleared with history (2811+), and not used in Private Browsing mode
* [SETTING] General>Startup>Restore previous session ***/
user_pref("browser.startup.page", 0);
/* 0103: set HOME+NEWWINDOW page
* about:home=Firefox Home (default, see 0105), custom URL, about:blank
* about:home=Firefox Home (default, see 0105), custom URLs..., Blank Page
* [SETTING] Home>New Windows and Tabs>Homepage and new windows ***/
user_pref("browser.startup.homepage", "about:blank");
user_pref("browser.startup.homepage", "chrome://browser/content/blanktab.html");
/* 0104: set NEWTAB page
* true=Firefox Home (default, see 0105), false=blank page
* [SETTING] Home>New Windows and Tabs>New tabs ***/
user_pref("browser.newtabpage.enabled", false);
/* 0105: disable sponsored content on Firefox Home (Activity Stream)
* [SETTING] Home>Firefox Home Content ***/
user_pref("browser.newtabpage.activity-stream.showSponsored", false); // [FF58+]
user_pref("browser.newtabpage.activity-stream.showSponsoredTopSites", false); // [FF83+] Shortcuts>Sponsored shortcuts
user_pref("browser.newtabpage.activity-stream.showSponsored", false); // [FF58+] Sponsored stories
user_pref("browser.newtabpage.activity-stream.showSponsoredTopSites", false); // [FF83+] Sponsored shortcuts
user_pref("browser.newtabpage.activity-stream.showSponsoredCheckboxes", false); // [FF140+] Support Firefox
/* 0106: clear default topsites
* [NOTE] This does not block you from adding your own ***/
user_pref("browser.newtabpage.activity-stream.default.sites", "");
/*** [SECTION 0200]: GEOLOCATION ***/
user_pref("_user.js.parrot", "0200 syntax error: the parrot's definitely deceased!");
/* 0201: use Mozilla geolocation service instead of Google if permission is granted [FF74+]
* Optionally enable logging to the console (defaults to false) ***/
user_pref("geo.provider.network.url", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
// user_pref("geo.provider.network.logging.enabled", true); // [HIDDEN PREF]
/* 0202: disable using the OS's geolocation service ***/
user_pref("geo.provider.ms-windows-location", false); // [WINDOWS]
user_pref("geo.provider.use_corelocation", false); // [MAC]
user_pref("geo.provider.use_gpsd", false); // [LINUX] [HIDDEN PREF]
user_pref("geo.provider.use_geoclue", false); // [FF102+] [LINUX]
/*** [SECTION 0300]: QUIETER FOX ***/
@ -121,50 +118,19 @@ user_pref("extensions.getAddons.showPane", false); // [HIDDEN PREF]
/* 0321: disable recommendations in about:addons' Extensions and Themes panes [FF68+] ***/
user_pref("extensions.htmlaboutaddons.recommendations.enabled", false);
/* 0322: disable personalized Extension Recommendations in about:addons and AMO [FF65+]
* [NOTE] This pref has no effect when Health Reports (0331) are disabled
* [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to make personalized extension recommendations
* [NOTE] This pref has no effect when Health Reports (8501) are disabled
* [SETTING] Privacy & Security>Firefox Data Collection and Use>Allow personalized extension recommendations
* [1] https://support.mozilla.org/kb/personalized-extension-recommendations ***/
user_pref("browser.discovery.enabled", false);
/* 0323: disable shopping experience [FF116+]
* [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1840156#c0 ***/
user_pref("browser.shopping.experience2023.enabled", false); // [DEFAULT: false]
/** TELEMETRY ***/
/* 0330: disable new data submission [FF41+]
* If disabled, no policy is shown or upload takes place, ever
* [1] https://bugzilla.mozilla.org/1195552 ***/
user_pref("datareporting.policy.dataSubmissionEnabled", false);
/* 0331: disable Health Reports
* [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send technical... data ***/
user_pref("datareporting.healthreport.uploadEnabled", false);
/* 0332: disable telemetry
* The "unified" pref affects the behavior of the "enabled" pref
* - If "unified" is false then "enabled" controls the telemetry module
* - If "unified" is true then "enabled" only controls whether to record extended data
* [NOTE] "toolkit.telemetry.enabled" is now LOCKED to reflect prerelease (true) or release builds (false) [2]
* [1] https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/internals/preferences.html
* [2] https://medium.com/georg-fritzsche/data-preference-changes-in-firefox-58-2d5df9c428b5 ***/
user_pref("toolkit.telemetry.unified", false);
user_pref("toolkit.telemetry.enabled", false); // see [NOTE]
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+]
/* 0333: disable Telemetry Coverage
* [1] https://blog.mozilla.org/data/2018/08/20/effectively-measuring-search-in-firefox/ ***/
user_pref("toolkit.telemetry.coverage.opt-out", true); // [HIDDEN PREF]
user_pref("toolkit.coverage.opt-out", true); // [FF64+] [HIDDEN PREF]
user_pref("toolkit.coverage.endpoint.base", "");
/** ACTIVITY STREAM ***/
/* 0335: disable Firefox Home (Activity Stream) telemetry ***/
user_pref("browser.newtabpage.activity-stream.feeds.telemetry", false);
user_pref("browser.newtabpage.activity-stream.telemetry", false);
/** STUDIES ***/
/* 0340: disable Studies
* [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to install and run studies ***/
* [SETTING] Privacy & Security>Firefox Data Collection and Use>Install and run studies ***/
user_pref("app.shield.optoutstudies.enabled", false);
/* 0341: disable Normandy/Shield [FF60+]
* Shield is a telemetry system that can push and test "recipes"
@ -178,7 +144,7 @@ user_pref("breakpad.reportURL", "");
user_pref("browser.tabs.crashReporting.sendReport", false); // [FF44+]
// user_pref("browser.crashReports.unsubmittedCheck.enabled", false); // [FF51+] [DEFAULT: false]
/* 0351: enforce no submission of backlogged Crash Reports [FF58+]
* [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send backlogged crash reports ***/
* [SETTING] Privacy & Security>Firefox Data Collection and Use>Send backlogged crash reports ***/
user_pref("browser.crashReports.unsubmittedCheck.autoSubmit2", false); // [DEFAULT: false]
/** OTHER ***/
@ -236,9 +202,9 @@ user_pref("network.prefetch-next", false);
/* 0602: disable DNS prefetching
* [1] https://developer.mozilla.org/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control ***/
user_pref("network.dns.disablePrefetch", true);
// user_pref("network.dns.disablePrefetchFromHTTPS", true); // [DEFAULT: true]
user_pref("network.dns.disablePrefetchFromHTTPS", true);
/* 0603: disable predictor / prefetching ***/
user_pref("network.predictor.enabled", false);
user_pref("network.predictor.enabled", false); // [DEFAULT: false FF144+]
user_pref("network.predictor.enable-prefetch", false); // [FF48+] [DEFAULT: false]
/* 0604: disable link-mouseover opening connection to linked server
* [1] https://news.slashdot.org/story/15/08/14/2321202/how-to-quash-firefoxs-silent-requests ***/
@ -266,7 +232,7 @@ user_pref("network.file.disable_unc_paths", true); // [HIDDEN PREF]
* [1] https://bugzilla.mozilla.org/1433507
* [2] https://en.wikipedia.org/wiki/GVfs
* [3] https://en.wikipedia.org/wiki/GIO_(software) ***/
user_pref("network.gio.supported-protocols", ""); // [HIDDEN PREF] [DEFAULT: "" FF118+]
user_pref("network.gio.supported-protocols", ""); // [HIDDEN PREF] [DEFAULT: ""]
/* 0705: disable proxy direct failover for system requests [FF91+]
* [WARNING] Default true is a security feature against malicious extensions [1]
* [SETUP-CHROME] If you use a proxy and you trust your extensions
@ -284,7 +250,7 @@ user_pref("network.gio.supported-protocols", ""); // [HIDDEN PREF] [DEFAULT: ""
* [SETTING] Privacy & Security>DNS over HTTPS
* [1] https://hacks.mozilla.org/2018/05/a-cartoon-intro-to-dns-over-https/
* [2] https://wiki.mozilla.org/Security/DOH-resolver-policy
* [3] https://support.mozilla.org/en-US/kb/firefox-dns-over-https
* [3] https://support.mozilla.org/kb/firefox-dns-over-https
* [4] https://www.eff.org/deeplinks/2020/12/dns-doh-and-odoh-oh-my-year-review-2020 ***/
// user_pref("network.trr.mode", 3);
/* 0712: set DoH provider
@ -303,13 +269,13 @@ user_pref("browser.urlbar.speculativeConnect.enabled", false);
* [NOTE] The UI is controlled by the .enabled pref
* [SETTING] Search>Address Bar>Suggestions from...
* [1] https://blog.mozilla.org/data/2021/09/15/data-and-firefox-suggest/ ***/
// user_pref("browser.urlbar.quicksuggest.enabled", false); // [FF92+] [DEFAULT: false]
// user_pref("browser.urlbar.suggest.quicksuggest.nonsponsored", false); // [FF95+] [DEFAULT: false]
// user_pref("browser.urlbar.suggest.quicksuggest.sponsored", false); // [FF92+] [DEFAULT: false]
user_pref("browser.urlbar.quicksuggest.enabled", false); // [FF92+]
user_pref("browser.urlbar.suggest.quicksuggest.nonsponsored", false); // [FF95+]
user_pref("browser.urlbar.suggest.quicksuggest.sponsored", false); // [FF92+]
/* 0803: disable live search suggestions
* [NOTE] Both must be true for live search to work in the location bar
* [SETUP-CHROME] Override these if you trust and use a privacy respecting search engine
* [SETTING] Search>Provide search suggestions | Show search suggestions in address bar results ***/
* [SETTING] Search>Show search suggestions | Show search suggestions in address bar results ***/
user_pref("browser.search.suggest.enabled", false);
user_pref("browser.urlbar.suggest.searches", false);
/* 0805: disable urlbar trending search suggestions [FF118+]
@ -317,15 +283,21 @@ user_pref("browser.urlbar.suggest.searches", false);
user_pref("browser.urlbar.trending.featureGate", false);
/* 0806: disable urlbar suggestions ***/
user_pref("browser.urlbar.addons.featureGate", false); // [FF115+]
user_pref("browser.urlbar.mdn.featureGate", false); // [FF117+] [HIDDEN PREF]
user_pref("browser.urlbar.pocket.featureGate", false); // [FF116+] [DEFAULT: false]
user_pref("browser.urlbar.weather.featureGate", false); // [FF108+] [DEFAULT: false]
user_pref("browser.urlbar.yelp.featureGate", false); // [FF124+] [DEFAULT: false]
user_pref("browser.urlbar.amp.featureGate", false); // [FF141+] adMarketplace
user_pref("browser.urlbar.fakespot.featureGate", false); // [FF130+] [DEFAULT: false]
user_pref("browser.urlbar.mdn.featureGate", false); // [FF117+]
user_pref("browser.urlbar.weather.featureGate", false); // [FF108+]
user_pref("browser.urlbar.wikipedia.featureGate", false); // [FF141+]
user_pref("browser.urlbar.yelp.featureGate", false); // [FF124+]
/* 0807: disable urlbar clipboard suggestions [FF118+] ***/
// user_pref("browser.urlbar.clipboard.featureGate", false);
/* 0808: disable recent searches [FF120+]
* [NOTE] Recent searches are cleared with history (2811+)
* [1] https://support.mozilla.org/kb/search-suggestions-firefox ***/
// user_pref("browser.urlbar.recentsearches.featureGate", false);
/* 0810: disable search and form history
* [NOTE] We also clear formdata on exit (2811+)
* [SETUP-WEB] Be aware that autocomplete form data can be read by third parties [1][2]
* [NOTE] We also clear formdata on exit (2811)
* [SETTING] Privacy & Security>History>Custom Settings>Remember search and form history
* [1] https://blog.mindedsecurity.com/2011/10/autocompleteagain.html
* [2] https://bugzilla.mozilla.org/381681 ***/
@ -337,7 +309,7 @@ user_pref("browser.formfill.enable", false);
/* 0820: disable coloring of visited links
* [SETUP-HARDEN] Bulk rapid history sniffing was mitigated in 2010 [1][2]. Slower and more expensive
* redraw timing attacks were largely mitigated in FF77+ [3]. Using RFP (4501) further hampers timing
* attacks. Don't forget clearing history on exit (2811). However, social engineering [2#limits][4][5]
* attacks. Don't forget clearing history on exit (2811+). However, social engineering [2#limits][4][5]
* and advanced targeted timing attacks could still produce usable results
* [1] https://developer.mozilla.org/docs/Web/CSS/Privacy_and_the_:visited_selector
* [2] https://dbaron.org/mozilla/visited-privacy
@ -357,7 +329,7 @@ user_pref("_user.js.parrot", "0900 syntax error: the parrot's expired!");
/* 0903: disable auto-filling username & password form fields
* can leak in cross-site forms *and* be spoofed
* [NOTE] Username & password is still available when you enter the field
* [SETTING] Privacy & Security>Logins and Passwords>Autofill logins and passwords
* [SETTING] Privacy & Security>Passwords>Autofill logins and passwords
* [1] https://freedom-to-tinker.com/2017/12/27/no-boundaries-for-user-identities-web-trackers-exploit-browser-login-managers/
* [2] https://homes.esat.kuleuven.be/~asenol/leaky-forms/ ***/
user_pref("signon.autofillForms", false);
@ -373,14 +345,17 @@ user_pref("network.auth.subresource-http-auth-allow", 1);
* [SETTING] Privacy & Security>Logins and Passwords>Allow Windows single sign-on for...
* [1] https://support.mozilla.org/kb/windows-sso ***/
// user_pref("network.http.windows-sso.enabled", false); // [DEFAULT: false]
/* 0907: enforce no automatic authentication on Microsoft sites [FF131+] [MAC]
* On macOS, SSO only works on corporate devices ***/
// user_pref("network.http.microsoft-entra-sso.enabled", false); // [DEFAULT: false]
/*** [SECTION 1000]: DISK AVOIDANCE ***/
user_pref("_user.js.parrot", "1000 syntax error: the parrot's gone to meet 'is maker!");
/* 1001: disable disk cache
* [SETUP-CHROME] If you think disk cache helps perf, then feel free to override this
* [NOTE] We also clear cache on exit (2811) ***/
* [NOTE] We also clear cache on exit (2811+)
* [SETUP-CHROME] If you think disk cache helps perf, then feel free to override this ***/
user_pref("browser.cache.disk.enable", false);
/* 1002: disable media cache from writing to disk in Private Browsing
/* 1002: set media cache in Private Browsing to in-memory and increase its maximum size
* [NOTE] MSE (Media Source Extensions) are already stored in-memory in PB ***/
user_pref("browser.privatebrowsing.forceMediaMemoryCache", true); // [FF75+]
user_pref("media.memory_cache_max_size", 65536);
@ -426,28 +401,6 @@ user_pref("security.ssl.require_safe_negotiation", true);
* [3] 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)
[1] https://scotthelme.co.uk/revocation-is-broken/
[2] https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/
***/
/* 1211: enforce OCSP fetching to confirm current validity of certificates
* 0=disabled, 1=enabled (default), 2=enabled for EV certificates only
* OCSP (non-stapled) leaks information about the sites you visit to the CA (cert authority)
* It's a trade-off between security (checking) and privacy (leaking info to the CA)
* [NOTE] This pref only controls OCSP fetching and does not affect OCSP stapling
* [SETTING] Privacy & Security>Security>Certificates>Query OCSP responder servers...
* [1] https://en.wikipedia.org/wiki/Ocsp ***/
user_pref("security.OCSP.enabled", 1); // [DEFAULT: 1]
/* 1212: set OCSP fetch failures (non-stapled, see 1211) to hard-fail
* [SETUP-WEB] SEC_ERROR_OCSP_SERVER_ERROR
* 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) ***/
/* 1223: enable strict PKP (Public Key Pinning)
* 0=disabled, 1=allow user MiTM (default; such as your antivirus), 2=strict
@ -459,9 +412,10 @@ user_pref("security.cert_pinning.enforcement_level", 2);
* 2 = consult CRLite and enforce both "Revoked" and "Not Revoked" results
* 3 = consult CRLite and enforce "Not Revoked" results, but defer to OCSP for "Revoked" (default)
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1429800,1670985,1753071
* [2] https://blog.mozilla.org/security/tag/crlite/ ***/
user_pref("security.remote_settings.crlite_filters.enabled", true);
user_pref("security.pki.crlite_mode", 2);
* [2] https://blog.mozilla.org/security/tag/crlite/
* [3] https://hacks.mozilla.org/2025/08/crlite-fast-private-and-comprehensive-certificate-revocation-checking-in-firefox/ ***/
user_pref("security.remote_settings.crlite_filters.enabled", true); // [DEFAULT: true FF137+]
user_pref("security.pki.crlite_mode", 2); // [DEFAULT: 2 FF142+]
/** MIXED CONTENT ***/
/* 1241: disable insecure passive content (such as images) on https pages ***/
@ -530,7 +484,7 @@ user_pref("_user.js.parrot", "2000 syntax error: the parrot's snuffed it!");
user_pref("media.peerconnection.ice.proxy_only_if_behind_proxy", true);
/* 2003: force a single network interface for ICE candidates generation [FF42+]
* When using a system-wide proxy, it uses the proxy interface
* [1] https://developer.mozilla.org/en-US/docs/Web/API/RTCIceCandidate
* [1] https://developer.mozilla.org/docs/Web/API/RTCIceCandidate
* [2] https://wiki.mozilla.org/Media/WebRTC/Privacy ***/
user_pref("media.peerconnection.ice.default_address_only", true);
/* 2004: force exclusion of private IPs from ICE candidates [FF51+]
@ -565,8 +519,6 @@ user_pref("devtools.debugger.remote-enabled", false); // [DEFAULT: false]
/* 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: use Punycode in Internationalized Domain Names to eliminate possible spoofing
* [SETUP-WEB] Might be undesirable for non-latin alphabet users since legitimate IDN's are also punycoded
* [TEST] https://www.xn--80ak6aa92e.com/ (www.apple.com)
@ -587,13 +539,19 @@ user_pref("network.IDN_show_punycode", true);
* [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=pdf.js+firefox ***/
user_pref("pdfjs.disabled", false); // [DEFAULT: false]
user_pref("pdfjs.enableScripting", false); // [FF86+]
/* 2624: disable middle click on new tab button opening URLs or searches using clipboard [FF115+] */
/* 2624: disable middle click on new tab button opening URLs or searches using clipboard [FF115+] ***/
user_pref("browser.tabs.searchclipboardfor.middleclick", false); // [DEFAULT: false NON-LINUX]
/* 2630: disable content analysis by DLP (Data Loss Prevention) agents
* DLP agents are background processes on managed computers that allow enterprises to monitor locally running
* applications for data exfiltration events, which they can allow/block based on customer defined DLP policies.
* [1] https://github.com/chromium/content_analysis_sdk */
user_pref("browser.contentanalysis.default_allow", false); // [FF124+] [DEFAULT: false]
* 0=Block all requests, 1=Warn on all requests (which lets the user decide), 2=Allow all requests
* [1] https://github.com/chromium/content_analysis_sdk ***/
user_pref("browser.contentanalysis.enabled", false); // [FF121+] [DEFAULT: false]
user_pref("browser.contentanalysis.default_result", 0); // [FF127+] [DEFAULT: 0]
/* 2635: disable referrer and storage access for resources injected by content scripts [FF139+] ***/
// user_pref("privacy.antitracking.isolateContentScriptResources", true);
/* 2640: disable CSP Level 2 Reporting [FF140+] ***/
user_pref("security.csp.reporting.enabled", false);
/** DOWNLOADS ***/
/* 2651: enable user interaction for security by always asking where to download
@ -638,79 +596,66 @@ user_pref("browser.contentblocking.category", "strict"); // [HIDDEN PREF]
* Opener and redirect heuristics are granted for 30 days, see [3]
* [1] https://blog.mozilla.org/security/2021/07/13/smartblock-v2/
* [2] https://hg.mozilla.org/mozilla-central/rev/e5483fd469ab#l4.12
* [3] https://developer.mozilla.org/en-US/docs/Web/Privacy/State_Partitioning#storage_access_heuristics ***/
* [3] https://developer.mozilla.org/docs/Web/Privacy/State_Partitioning#storage_access_heuristics ***/
// user_pref("privacy.antitracking.enableWebcompat", false);
/*** [SECTION 2800]: SHUTDOWN & SANITIZING ***/
user_pref("_user.js.parrot", "2800 syntax error: the parrot's bleedin' demised!");
/* 2810: enable Firefox to clear items on shutdown
* [NOTE] In FF129+ clearing "siteSettings" on shutdown (2811+), or manually via site data (2820+) and
* via history (2830), will no longer remove sanitize on shutdown "cookie and site data" site exceptions (2815)
* [SETTING] Privacy & Security>History>Custom Settings>Clear history when Firefox closes | Settings ***/
user_pref("privacy.sanitize.sanitizeOnShutdown", true);
/** SANITIZE ON SHUTDOWN: IGNORES "ALLOW" SITE EXCEPTIONS | v2 migration is FF128+ ***/
/* 2811: set/enforce what items to clear on shutdown (if 2810 is true) [SETUP-CHROME]
* [NOTE] If "history" is true, downloads will also be cleared ***/
user_pref("privacy.clearOnShutdown.cache", true); // [DEFAULT: true]
user_pref("privacy.clearOnShutdown_v2.cache", true); // [FF128+] [DEFAULT: true]
user_pref("privacy.clearOnShutdown.downloads", true); // [DEFAULT: true]
user_pref("privacy.clearOnShutdown.formdata", true); // [DEFAULT: true]
user_pref("privacy.clearOnShutdown.history", true); // [DEFAULT: true]
user_pref("privacy.clearOnShutdown_v2.historyFormDataAndDownloads", true); // [FF128+] [DEFAULT: true]
// user_pref("privacy.clearOnShutdown.siteSettings", false); // [DEFAULT: false]
// user_pref("privacy.clearOnShutdown_v2.siteSettings", false); // [FF128+] [DEFAULT: false]
/* 2812: set Session Restore to clear on shutdown (if 2810 is true) [FF34+]
* [NOTE] Not needed if Session Restore is not used (0102) or it is already cleared with history (2811)
/** SANITIZE ON SHUTDOWN: IGNORES "ALLOW" SITE EXCEPTIONS ***/
/* 2811: set/enforce clearOnShutdown items (if 2810 is true) [SETUP-CHROME] [FF128+] ***/
user_pref("privacy.clearOnShutdown_v2.cache", true); // [DEFAULT: true]
user_pref("privacy.clearOnShutdown_v2.historyFormDataAndDownloads", true); // [DEFAULT: true]
// user_pref("privacy.clearOnShutdown_v2.siteSettings", false); // [DEFAULT: false]
/* 2812: set/enforce clearOnShutdown items [FF136+] ***/
user_pref("privacy.clearOnShutdown_v2.browsingHistoryAndDownloads", true); // [DEFAULT: true]
user_pref("privacy.clearOnShutdown_v2.downloads", true); // [HIDDEN]
user_pref("privacy.clearOnShutdown_v2.formdata", true);
/* 2813: set Session Restore to clear on shutdown (if 2810 is true) [FF34+]
* [NOTE] Not needed if Session Restore is not used (0102) or it is already cleared with history (2811+)
* [NOTE] If true, this prevents resuming from crashes (also see 5008) ***/
// user_pref("privacy.clearOnShutdown.openWindows", true);
/** SANITIZE ON SHUTDOWN: RESPECTS "ALLOW" SITE EXCEPTIONS FF103+ | v2 migration is FF128+ ***/
/* 2815: set "Cookies" and "Site Data" to clear on shutdown (if 2810 is true) [SETUP-CHROME]
* [NOTE] Exceptions: A "cookie" block permission also controls "offlineApps" (see note below).
* serviceWorkers require an "Allow" permission. For cross-domain logins, add exceptions for
* both sites e.g. https://www.youtube.com (site) + https://accounts.google.com (single sign on)
* [NOTE] "offlineApps": Offline Website Data: localStorage, service worker cache, QuotaManager (IndexedDB, asm-cache)
* [NOTE] "sessions": Active Logins (has no site exceptions): refers to HTTP Basic Authentication [1], not logins via cookies
/** SANITIZE ON SHUTDOWN: RESPECTS "ALLOW" SITE EXCEPTIONS ***/
/* 2815: set "Cookies" and "Site Data" to clear on shutdown (if 2810 is true) [SETUP-CHROME] [FF128+]
* [NOTE] Exceptions: For cross-domain logins, add exceptions for both sites
* e.g. https://www.youtube.com (site) + https://accounts.google.com (single sign on)
* [WARNING] Be selective with what sites you "Allow", as they also disable partitioning (1767271)
* [SETTING] to add site exceptions: Ctrl+I>Permissions>Cookies>Allow (when on the website in question)
* [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Settings
* [1] https://en.wikipedia.org/wiki/Basic_access_authentication ***/
user_pref("privacy.clearOnShutdown.cookies", true); // Cookies
user_pref("privacy.clearOnShutdown.offlineApps", true); // Site Data
user_pref("privacy.clearOnShutdown.sessions", true); // Active Logins [DEFAULT: true]
user_pref("privacy.clearOnShutdown_v2.cookiesAndStorage", true); // Cookies, Site Data, Active Logins [FF128+]
* [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Settings ***/
user_pref("privacy.clearOnShutdown_v2.cookiesAndStorage", true);
/** SANITIZE SITE DATA: IGNORES "ALLOW" SITE EXCEPTIONS ***/
/* 2820: set manual "Clear Data" items [SETUP-CHROME] [FF128+]
* Firefox remembers your last choices. This will reset them when you start Firefox
* [SETTING] Privacy & Security>Browser Privacy>Cookies and Site Data>Clear Data ***/
user_pref("privacy.clearSiteData.cache", true);
user_pref("privacy.clearSiteData.cache", true); // [DEFAULT: true]
user_pref("privacy.clearSiteData.cookiesAndStorage", false); // keep false until it respects "allow" site exceptions
user_pref("privacy.clearSiteData.historyFormDataAndDownloads", true);
// user_pref("privacy.clearSiteData.siteSettings", false);
/* 2821: set manual "Clear Data" items [FF136+] ***/
user_pref("privacy.clearSiteData.browsingHistoryAndDownloads", true);
user_pref("privacy.clearSiteData.formdata", true);
/** SANITIZE HISTORY: IGNORES "ALLOW" SITE EXCEPTIONS | clearHistory migration is FF128+ ***/
/* 2830: set manual "Clear History" items, also via Ctrl-Shift-Del [SETUP-CHROME]
/** SANITIZE HISTORY: IGNORES "ALLOW" SITE EXCEPTIONS ***/
/* 2830: set manual "Clear History" items, also via Ctrl-Shift-Del [SETUP-CHROME] [FF128+]
* Firefox remembers your last choices. This will reset them when you start Firefox
* [NOTE] Regardless of what you set "downloads" to, as soon as the dialog
* for "Clear Recent History" is opened, it is synced to the same as "history"
* [SETTING] Privacy & Security>History>Custom Settings>Clear History ***/
user_pref("privacy.cpd.cache", true); // [DEFAULT: true]
user_pref("privacy.clearHistory.cache", true);
user_pref("privacy.cpd.formdata", true); // [DEFAULT: true]
user_pref("privacy.cpd.history", true); // [DEFAULT: true]
// user_pref("privacy.cpd.downloads", true); // not used, see note above
user_pref("privacy.clearHistory.historyFormDataAndDownloads", true);
user_pref("privacy.cpd.cookies", false);
user_pref("privacy.cpd.sessions", true); // [DEFAULT: true]
user_pref("privacy.cpd.offlineApps", false); // [DEFAULT: false]
user_pref("privacy.clearHistory.cache", true); // [DEFAULT: true]
user_pref("privacy.clearHistory.cookiesAndStorage", false);
// user_pref("privacy.cpd.openWindows", false); // Session Restore
// user_pref("privacy.cpd.passwords", false);
// user_pref("privacy.cpd.siteSettings", false);
// user_pref("privacy.clearHistory.siteSettings", false);
user_pref("privacy.clearHistory.historyFormDataAndDownloads", true); // [DEFAULT: true]
// user_pref("privacy.clearHistory.siteSettings", false); // [DEFAULT: false]
/* 2831: set manual "Clear History" items [FF136+] ***/
user_pref("privacy.clearHistory.browsingHistoryAndDownloads", true); // [DEFAULT: true]
user_pref("privacy.clearHistory.formdata", true);
/** SANITIZE MANUAL: TIMERANGE ***/
/* 2840: set "Time range to clear" for "Clear Data" (2820) and "Clear History" (2830)
/* 2840: set "Time range to clear" for "Clear Data" (2820+) and "Clear History" (2830+)
* Firefox remembers your last choice. This will reset the value when you start Firefox
* 0=everything, 1=last hour, 2=last two hours, 3=last four hours, 4=today
* [NOTE] Values 5 (last 5 minutes) and 6 (last 24 hours) are not listed in the dropdown,
@ -722,41 +667,57 @@ user_pref("privacy.sanitize.timeSpan", 0);
In FF118+ FPP is on by default in private windows (4001) and in FF119+ is controlled
by ETP (2701). FPP will also use Remote Services in future to relax FPP protections
on a per site basis for compatibility (4003).
on a per site basis for compatibility (4004).
1826408 - restrict fonts to system (kBaseFonts + kLangPackFonts) (Windows, Mac, some Linux)
https://searchfox.org/mozilla-central/source/toolkit/components/resistfingerprinting/RFPTargetsDefault.inc
[NOTE] RFPTargets + granular overrides are somewhat experimental and may produce unexpected results
- e.g. FrameRate can only be controlled per process, not per origin
1826408 - restrict to system fonts (kBaseFonts + kLangPackFonts) (Windows, Mac, some Linux) (FF119+)
1928705: android (FF134+)
https://searchfox.org/mozilla-central/search?path=StandardFonts*.inc
1858181 - subtly randomize canvas per eTLD+1, per session and per window-mode (FF120+)
1887682 - use fdlibm's sin, cos and tan in jsmath (FF134+)
1978414 - various (FF143+)
1954194: available screen resolution: return a fixed offset height from screen per platform when not full screen
1978414 & 1984333: hardwareConcurrency: return 2 (FF143) | less than 8 return 4 else return 8 (FF144+)
1977836: maxTouchPoints: return multi-touch as 5
***/
user_pref("_user.js.parrot", "4000 syntax error: the parrot's bereft of life!");
/* 4001: enable FPP in PB mode [FF114+]
* [NOTE] In FF119+, FPP for all modes (7016) is enabled with ETP Strict (2701) ***/
// user_pref("privacy.fingerprintingProtection.pbmode", true); // [DEFAULT: true FF118+]
// user_pref("privacy.fingerprintingProtection.pbmode", true); // [DEFAULT: true]
/* 4002: set global FPP overrides [FF114+]
* Controls what protections FPP uses globally, including "RFPTargets" (despite the name these are
* not used by RFP) e.g. "+AllTargets,-CSSPrefersColorScheme" or "-AllTargets,+CanvasRandomization"
* [NOTE] Be aware that not all RFP protections are necessarily in RFPTargets
* [WARNING] Not recommended. Either use RFP or FPP at defaults
* uses "RFPTargets" [1] which despite the name these are not used by RFP
* e.g. "+AllTargets,-CSSPrefersColorScheme,-JSDateTimeUTC" = all targets but allow prefers-color-scheme and do not change timezone
* e.g. "-AllTargets,+CanvasRandomization,+JSDateTimeUTC" = no targets but do use FPP canvas and change timezone
* [NOTE] Not supported by arkenfox. Either use RFP or FPP at defaults
* [1] https://searchfox.org/mozilla-central/source/toolkit/components/resistfingerprinting/RFPTargets.inc ***/
// user_pref("privacy.fingerprintingProtection.overrides", "");
/* 4003: disable remote FPP overrides [FF127+] ***/
/* 4003: set granular FPP overrides
* JSON format: e.g."[{\"firstPartyDomain\": \"netflix.com\", \"overrides\": \"-CanvasRandomization,-FrameRate,\"}]"
* [NOTE] Not supported by arkenfox. Either use RFP or FPP at defaults ***/
// user_pref("privacy.fingerprintingProtection.granularOverrides", "");
/* 4004: disable remote FPP overrides [FF127+] ***/
// user_pref("privacy.fingerprintingProtection.remoteOverrides.enabled", false);
/*** [SECTION 4500]: RFP (resistFingerprinting)
/*** [SECTION 4500]: OPTIONAL RFP (resistFingerprinting)
RFP overrides FPP (4000)
It is an all-or-nothing buy in: you cannot pick and choose what parts you want
[TEST] https://arkenfox.github.io/TZP/tzp.html
FF128+ Arkenfox by default uses FPP (automatically enabled with ETP Strict). For most people
this is all you need. To use RFP instead, add RFP (4501) to your overrides, and optionally
add letterboxing (4504), spoof_english (4506), and WebGL (4520).
RFP is an all-or-nothing buy in: you cannot pick and choose what parts you want
[WARNING] DO NOT USE extensions to alter RFP protected metrics
418986 - limit window.screen & CSS media queries (FF41)
1281949 - spoof screen orientation (FF50)
1360039 - spoof navigator.hardwareConcurrency as 2 (FF55)
FF56
1333651 - spoof User Agent & Navigator API
version: android version spoofed as ESR (FF119 or lower)
OS: JS spoofed as Windows 10, OS 10.15, Android 10, or Linux | HTTP Headers spoofed as Windows or Android
JS: spoofed as Windows 10, OS X 10.15, Android 10, or Linux
HTTP Header: spoofed as Windows 10 or Android 10 until FF136 then matches JS spoof
1369319 - disable device sensor API
1369357 - disable site specific zoom
1337161 - hide gamepads from content
@ -775,10 +736,12 @@ user_pref("_user.js.parrot", "4000 syntax error: the parrot's bereft of life!");
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.
1337157 - disable WebGL debug renderer info (FF60)
1459089 - disable OS locale in HTTP Accept-Language headers (ANDROID) (FF62)
1479239 - return "no-preference" with prefers-reduced-motion (FF63)
1363508 - spoof/suppress Pointer Events (FF64)
1363508 & 1826051 & 1957658 - spoof/suppress Pointer Events, spoof maxTouchPoints (FF64, FF132, FF143, ESR140.2)
FF64: maxTouchPoints: 0 = desktop
FF132: maxTouchPoints: 0 = mac | 10 = windows, linux, mobile
FF143/140.2: maxTouchPoints: 0 = mac, linux | 10 = windows | 5 = mobile
1492766 - spoof pointerEvent.pointerid (FF65)
1485266 - disable exposure of system colors to CSS or canvas (FF67)
1494034 - return "light" with prefers-color-scheme (FF67)
@ -790,23 +753,36 @@ user_pref("_user.js.parrot", "4000 syntax error: the parrot's bereft of life!");
1653987 - limit font visibility to bundled and "Base Fonts" (Windows, Mac, some Linux) (FF80)
1461454 - spoof smooth=true and powerEfficient=false for supported media in MediaCapabilities (FF82)
531915 - use fdlibm's sin, cos and tan in jsmath (FF93, ESR91.1)
1756280 - enforce navigator.pdfViewerEnabled as true and plugins/mimeTypes as hard-coded values (FF100-115)
1692609 - reduce JS timing precision to 16.67ms (previously FF55+ was 100ms) (FF102)
1422237 - return "srgb" with color-gamut (FF110)
1794628 - return "none" with inverted-colors (FF114)
1554751 - return devicePixelRatio as 2 (previously FF41+ was 1) (FF127)
1787790 - normalize system fonts (FF128)
1835987 - spoof timezone as Atlantic/Reykjavik (previously FF55+ was UTC) (FF128)
1834307 - always use smooth scrolling (FF132)
1918202 - spoof screen orientation based on spoofed screen size and platform (FF132)
previously FF50+ it always returned landscape-primary and an angle of 0
1390465 - load all subtitles in WebVTT (Video Text Tracks) (FF133)
1873382 - make spoofed devicePixelRatio and CSS media queries match (FF133)
previously FF41+ devicePixelRatio was hardcoded as 1 and FF127+ as 2
previously FF41+ CSS media queries were spoofed as zoom level at a devicePixelRatio of 1
1955425 - return 128 for WebGPU subgroupMaxSize (FF138)
1966860 - spoof WebGL debug renderer info (FF140)
previously FF60+ it was disabled
1781277 - return 10GiB for storage estimate until persistent-storage granted (FF142, ESR140.1)
1972600 - spoof network connection for HTMLMediaElement preload (FF142, ESR140.1)
1975851 - return true for navigator.onLine (FF142, ESR140.1)
1973265 - disable WebCodecs API (FF142?)
1984333 - spoof navigator.hardwareConcurrency as 4 except mac return 8 (FF144+)
previously FF55+ it returned 2
***/
user_pref("_user.js.parrot", "4500 syntax error: the parrot's popped 'is clogs");
/* 4501: enable RFP
* [SETUP-WEB] RFP can cause some website breakage: mainly canvas, use a canvas site exception via the urlbar.
* RFP also has a few side effects: mainly timezone is UTC, and websites will prefer light theme
* [NOTE] pbmode applies if true and the original pref is false
* [1] https://bugzilla.mozilla.org/418986 ***/
user_pref("privacy.resistFingerprinting", true); // [FF41+]
* [SETUP-WEB] RFP can cause some website breakage: mainly canvas, use a canvas site exception via the urlbar.
* RFP also has a few side effects: mainly that timezone is GMT, and websites will prefer light theme ***/
// user_pref("privacy.resistFingerprinting", true); // [FF41+]
// user_pref("privacy.resistFingerprinting.pbmode", true); // [FF114+]
/* 4502: set new window size rounding max values [FF55+]
/* 4502: set RFP new window size max rounded values [FF55+]
* [SETUP-CHROME] sizes round down in hundreds: width to 200s and height to 100s, to fit your screen
* [1] https://bugzilla.mozilla.org/1330882 ***/
user_pref("privacy.window.maxInnerWidth", 1600);
@ -815,50 +791,47 @@ user_pref("privacy.window.maxInnerHeight", 900);
* [NOTE] To allow extensions to work on AMO, you also need 2662
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1384330,1406795,1415644,1453988 ***/
user_pref("privacy.resistFingerprinting.block_mozAddonManager", true);
/* 4504: enable RFP letterboxing [FF67+]
/* 4504: enable letterboxing [FF67+]
* Dynamically resizes the inner window by applying margins in stepped ranges [2]
* If you use the dimension pref, then it will only apply those resolutions.
* The format is "width1xheight1, width2xheight2, ..." (e.g. "800x600, 1000x1000")
* [SETUP-WEB] This is independent of RFP (4501). If you're not using RFP, or you are but
* dislike the margins, then flip this pref, keeping in mind that it is effectively fingerprintable
* [SETUP-WEB] This is independent of RFP (4501). If you're using RFP, but dislike the
* margins, then don't enable this pref, keeping in mind that it is effectively fingerprintable
* [WARNING] DO NOT USE: the dimension pref is only meant for testing
* [1] https://bugzilla.mozilla.org/1407366
* [2] https://hg.mozilla.org/mozilla-central/rev/6d2d7856e468#l2.32 ***/
user_pref("privacy.resistFingerprinting.letterboxing", true); // [HIDDEN PREF]
* [2] https://hg.mozilla.org/mozilla-central/rev/7211cb4f58ff#l5.13 ***/
// user_pref("privacy.resistFingerprinting.letterboxing", true); // [HIDDEN PREF]
// user_pref("privacy.resistFingerprinting.letterboxing.dimensions", ""); // [HIDDEN PREF]
/* 4505: experimental RFP [FF91+]
* [WARNING] DO NOT USE unless testing, see [1] comment 12
* [1] https://bugzilla.mozilla.org/1635603 ***/
/* 4505: disable RFP by domain [FF91+]
* [NOTE]: The pref takes comma separated values: e.g. "*domain1.tld, *domain2.tld"
* Working domain examples: "arkenfox.github.io", "*github.io"
* Non-working domain examples: "https://arkenfox.github.io", "github.io", "*arkenfox.github.io" ***/
// user_pref("privacy.resistFingerprinting.exemptedDomains", "*.example.invalid");
/* 4506: disable RFP spoof english prompt [FF59+]
* 0=prompt, 1=disabled, 2=enabled (requires RFP)
* 0=prompt, 1=disabled, 2=enabled
* [NOTE] When changing from value 2, preferred languages ('intl.accept_languages') is not reset.
* [SETUP-WEB] when enabled, sets 'en-US, en' for displaying pages and 'en-US' as locale.
* [SETTING] General>Language>Choose your preferred language for displaying pages>Choose>Request English... ***/
user_pref("privacy.spoof_english", 1);
/* 4507: skip browser.startup.blankWindow if RFP is used [FF136+] ***/
// user_pref("privacy.resistFingerprinting.skipEarlyBlankFirstPaint", true); // [DEFAULT: true]
/* 4510: disable using system colors
* [SETTING] General>Language and Appearance>Fonts and Colors>Colors>Use system colors ***/
user_pref("browser.display.use_system_colors", false); // [DEFAULT: false NON-WINDOWS]
/* 4511: enforce non-native widget theme
* Security: removes/reduces system API calls, e.g. win32k API [1]
* Fingerprinting: provides a uniform look and feel across platforms [2]
* [1] https://bugzilla.mozilla.org/1381938
* [2] https://bugzilla.mozilla.org/1411425 ***/
user_pref("widget.non-native-theme.enabled", true); // [DEFAULT: true]
/* 4511: disable using system accent colors ***/
user_pref("widget.non-native-theme.use-theme-accent", false); // [DEFAULT: false WINDOWS]
/* 4512: enforce links targeting new windows to open in a new tab instead
* 1=most recent window or tab, 2=new window, 3=new tab
* Stops malicious window sizes and some screen resolution leaks.
* You can still right-click a link and open in a new window
* [SETTING] General>Tabs>Open links in tabs instead of new windows
* [TEST] https://arkenfox.github.io/TZP/tzp.html#screen
* [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/9881 ***/
user_pref("browser.link.open_newwindow", 3); // [DEFAULT: 3]
/* 4513: set all open window methods to abide by "browser.link.open_newwindow" (4512)
* [1] https://searchfox.org/mozilla-central/source/dom/tests/browser/browser_test_new_window_from_content.js ***/
user_pref("browser.link.open_newwindow.restriction", 0);
/* 4520: disable WebGL (Web Graphics Library)
* [SETUP-WEB] If you need it then override it. RFP still randomizes canvas for naive scripts ***/
user_pref("webgl.disabled", true);
/* 4520: disable WebGL (Web Graphics Library) ***/
// user_pref("webgl.disabled", true);
/*** [SECTION 5000]: OPTIONAL OPSEC
Disk avoidance, application data isolation, eyeballs...
@ -919,7 +892,7 @@ user_pref("_user.js.parrot", "5000 syntax error: the parrot's taken 'is last bow
* [1] https://support.mozilla.org/kb/address-bar-autocomplete-firefox#w_url-autocomplete ***/
// user_pref("browser.urlbar.autoFill", false);
/* 5013: disable browsing and download history
* [NOTE] We also clear history and downloads on exit (2811)
* [NOTE] We also clear history and downloads on exit (2811+)
* [SETTING] Privacy & Security>History>Custom Settings>Remember browsing and download history ***/
// user_pref("places.history.enabled", false);
/* 5014: disable Windows jumplist [WINDOWS] ***/
@ -971,7 +944,7 @@ user_pref("_user.js.parrot", "5500 syntax error: this is an ex-parrot!");
* [2] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=asm.js
* [3] https://rh0dev.github.io/blog/2017/the-return-of-the-jit/ ***/
// user_pref("javascript.options.asmjs", false);
/* 5505: disable Ion and baseline JIT to harden against JS exploits
/* 5505: disable Ion and baseline JIT to harden against JS exploits [RESTART]
* [NOTE] When both Ion and JIT are disabled, and trustedprincipals
* is enabled, then Ion can still be used by extensions (1599226)
* [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=firefox+jit
@ -990,7 +963,7 @@ user_pref("_user.js.parrot", "5500 syntax error: this is an ex-parrot!");
// user_pref("javascript.options.wasm", false);
/* 5507: disable rendering of SVG OpenType fonts ***/
// user_pref("gfx.font_rendering.opentype_svg.enabled", false);
/* 5508: disable all DRM content (EME: Encryption Media Extension)
/* 5508: disable all DRM (Digital Rights Management) content (EME: Encryption Media Extension)
* Optionally hide the UI setting which also disables the DRM prompt
* [SETTING] General>DRM Content>Play DRM-controlled content
* [TEST] https://bitmovin.com/demos/drm
@ -1000,8 +973,8 @@ user_pref("_user.js.parrot", "5500 syntax error: this is an ex-parrot!");
/* 5509: disable IPv6 if using a VPN
* This is an application level fallback. Disabling IPv6 is best done at an OS/network
* level, and/or configured properly in system wide VPN setups.
* [SETUP-WEB] PR_CONNECT_RESET_ERROR
* [NOTE] PHP defaults to IPv6 with "localhost". Use "php -S 127.0.0.1:PORT"
* [SETUP-WEB] PR_CONNECT_RESET_ERROR
* [TEST] https://ipleak.org/
* [1] https://www.internetsociety.org/tag/ipv6-security/ (Myths 2,4,5,6) ***/
// user_pref("network.dns.disableIPv6", true);
@ -1042,15 +1015,25 @@ user_pref("security.tls.version.enable-deprecated", false); // [DEFAULT: false]
* [WHY] To prevent wasting Mozilla's time with a custom setup ***/
user_pref("extensions.webcompat-reporter.enabled", false); // [DEFAULT: false]
/* 6012: enforce Quarantined Domains [FF115+]
* [WHY] https://support.mozilla.org/kb/quarantined-domains */
* [WHY] https://support.mozilla.org/kb/quarantined-domains ***/
user_pref("extensions.quarantinedDomains.enabled", true); // [DEFAULT: true]
/* 6050: prefsCleaner: previously active items removed from arkenfox 115-127 ***/
// user_pref("accessibility.force_disabled", "");
// user_pref("browser.urlbar.dnsResolveSingleWordsAfterSearch", "");
// user_pref("network.protocol-handler.external.ms-windows-store", "");
// user_pref("privacy.partition.always_partition_third_party_non_cookie_storage", "");
// user_pref("privacy.partition.always_partition_third_party_non_cookie_storage.exempt_sessionstorage", "");
// user_pref("privacy.partition.serviceWorkers", "");
/* 6050: prefsCleaner: reset previously active items removed from arkenfox FF128+ ***/
// user_pref("privacy.clearOnShutdown.cache", "");
// user_pref("privacy.clearOnShutdown.cookies", "");
// user_pref("privacy.clearOnShutdown.downloads", "");
// user_pref("privacy.clearOnShutdown.formdata", "");
// user_pref("privacy.clearOnShutdown.history", "");
// user_pref("privacy.clearOnShutdown.offlineApps", "");
// user_pref("privacy.clearOnShutdown.sessions", "");
// user_pref("privacy.cpd.cache", "");
// user_pref("privacy.cpd.cookies", "");
// user_pref("privacy.cpd.formdata", "");
// user_pref("privacy.cpd.history", "");
// user_pref("privacy.cpd.offlineApps", "");
// user_pref("privacy.cpd.sessions", "");
/* 6051: prefsCleaner: reset previously active items removed from arkenfox FF140+ ***/
// user_pref("security.OCSP.enabled", "");
// user_pref("security.OCSP.require", "");
/*** [SECTION 7000]: DON'T BOTHER ***/
user_pref("_user.js.parrot", "7000 syntax error: the parrot's pushing up daisies!");
@ -1091,10 +1074,6 @@ user_pref("_user.js.parrot", "7000 syntax error: the parrot's pushing up daisies
* [WHY] Passive fingerprinting and perf costs. These are session-only
* and isolated with network partitioning (FF85+) and/or containers ***/
// user_pref("security.ssl.disable_session_identifiers", true);
/* 7006: onions
* [WHY] Firefox doesn't support hidden services. Use Tor Browser ***/
// user_pref("dom.securecontext.allowlist_onions", true); // [FF97+] 1382359/1744006
// user_pref("network.http.referer.hideOnionSource", true); // 1305144
/* 7007: referers
* [WHY] Only cross-origin referers (1602, 5510) matter ***/
// user_pref("network.http.sendRefererHeader", 2);
@ -1131,17 +1110,19 @@ user_pref("_user.js.parrot", "7000 syntax error: the parrot's pushing up daisies
* [NOTE] FPP (fingerprintingProtection) is ignored when RFP (4501) is enabled
* [WHY] Arkenfox only supports strict (2701) which sets these at runtime ***/
// user_pref("network.cookie.cookieBehavior", 5); // [DEFAULT: 5]
// user_pref("privacy.fingerprintingProtection", true); // [FF114+] [ETP FF119+]
// user_pref("network.cookie.cookieBehavior.optInPartitioning", true); // [ETP FF132+]
// user_pref("network.http.referer.disallowCrossSiteRelaxingDefault", true);
// user_pref("network.http.referer.disallowCrossSiteRelaxingDefault.top_navigation", true); // [FF100+]
// user_pref("privacy.partition.network_state.ocsp_cache", true); // [DEFAULT: true FF123+]
// user_pref("privacy.bounceTrackingProtection.mode", 1); // [FF131+] [ETP FF133+]
// user_pref("privacy.fingerprintingProtection", true); // [FF114+] [ETP FF119+]
// user_pref("privacy.partition.network_state.ocsp_cache", true); // [DEFAULT: true]
// user_pref("privacy.query_stripping.enabled", true); // [FF101+]
// user_pref("privacy.trackingprotection.enabled", true);
// user_pref("privacy.trackingprotection.socialtracking.enabled", true);
// user_pref("privacy.trackingprotection.cryptomining.enabled", true); // [DEFAULT: true]
// user_pref("privacy.trackingprotection.fingerprinting.enabled", true); // [DEFAULT: true]
/* 7017: disable service workers
* [WHY] Already isolated with TCP (2701) behind a pref (2710) ***/
* [WHY] Already isolated with TCP (2701) behind a pref ***/
// user_pref("dom.serviceWorkers.enabled", false);
/* 7018: disable Web Notifications [FF22+]
* [WHY] Web Notifications are behind a prompt (7002)
@ -1187,12 +1168,63 @@ user_pref("_user.js.parrot", "8000 syntax error: the parrot's crossed the Jordan
// user_pref("general.platform.override", "");
// user_pref("general.useragent.override", "");
// user_pref("media.navigator.enabled", "");
// user_pref("media.ondevicechange.enabled", "");
// user_pref("media.video_stats.enabled", "");
// user_pref("media.webspeech.synth.enabled", "");
// user_pref("ui.use_standins_for_native_colors", "");
// user_pref("webgl.enable-debug-renderer-info", "");
/*** [SECTION 8500]: TELEMETRY
Arkenfox does not consider Firefox telemetry to be a privacy or security concern - comments below.
But since most arkenfox users prefer it disabled, we'll do that rather than cause overrides.
Opt-out
- Telemetry is essential: a browser engine is a _very_ large complex beast costing billions to maintain
- Opt-in telemetry _does not_ work and results in data that is unrepresentative and may be misleading
Choice
- Every new profile on first use provides data collection/use policy and the abillty to opt-out
- It can be disabled at any time (Settings>Privacy & Security>Data Collection and Use)
Data
- no PII (Personally Identifiable Information)
- can be viewed in about:telemetry
- uses Prio [1][2][3], Glean [4], Oblivious HTTP [5][6]
[1] https://crypto.stanford.edu/prio/
[2] https://hacks.mozilla.org/2018/10/testing-privacy-preserving-telemetry-with-prio/
[3] https://blog.mozilla.org/security/2019/06/06/next-steps-in-privacy-preserving-telemetry-with-prio/
[4] https://firefox-source-docs.mozilla.org/toolkit/components/glean/index.html
[5] https://firefox-source-docs.mozilla.org/toolkit/components/glean/user/ohttp.html
[6] https://blog.mozilla.org/en/tag/oblivious-http/
***/
user_pref("_user.js.parrot", "8500 syntax error: the parrot's off the twig!");
/* 8500: disable new data submission [FF41+]
* If disabled, no policy is shown or upload takes place, ever
* [1] https://bugzilla.mozilla.org/1195552 ***/
user_pref("datareporting.policy.dataSubmissionEnabled", false);
/* 8501: disable Health Reports
* [SETTING] Privacy & Security>Firefox Data Collection and Use>Send technical... data ***/
user_pref("datareporting.healthreport.uploadEnabled", false);
/* 0802: disable telemetry
* The "unified" pref affects the behavior of the "enabled" pref
* - If "unified" is false then "enabled" controls the telemetry module
* - If "unified" is true then "enabled" only controls whether to record extended data
* [NOTE] "toolkit.telemetry.enabled" is now LOCKED to reflect prerelease (true) or release builds (false) [2]
* [1] https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/internals/preferences.html
* [2] https://medium.com/georg-fritzsche/data-preference-changes-in-firefox-58-2d5df9c428b5 ***/
user_pref("toolkit.telemetry.unified", false);
user_pref("toolkit.telemetry.enabled", false); // see [NOTE]
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+]
/* 8503: 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", "");
/*** [SECTION 9000]: NON-PROJECT RELATED ***/
user_pref("_user.js.parrot", "9000 syntax error: the parrot's cashed in 'is chips!");
/* 9001: disable welcome notices ***/
@ -1206,61 +1238,20 @@ user_pref("browser.urlbar.showSearchTerms.enabled", false);
/*** [SECTION 9999]: DEPRECATED / RENAMED ***/
user_pref("_user.js.parrot", "9999 syntax error: the parrot's shuffled off 'is mortal coil!");
/* ESR115.x still uses all the following prefs
/* ESR128.x still uses all the following prefs
// [NOTE] replace the * with a slash in the line above to re-enable active ones
// FF116
// 4506: set RFP's font visibility level (1402) [FF94+]
// [-] https://bugzilla.mozilla.org/1838415
// user_pref("layout.css.font-visibility.resistFingerprinting", 1); // [DEFAULT: 1]
// FF117
// 1221: disable Windows 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://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/21686
// [-] https://bugzilla.mozilla.org/1844908
user_pref("security.family_safety.mode", 0);
// 7018: disable service worker Web Notifications [FF44+]
// [WHY] Web Notifications are behind a prompt (7002)
// [1] https://blog.mozilla.org/en/products/firefox/block-notification-requests/
// [-] https://bugzilla.mozilla.org/1842457
// user_pref("dom.webnotifications.serviceworker.enabled", false);
// FF118
// 1402: limit font visibility (Windows, Mac, some Linux) [FF94+]
// Uses hardcoded lists with two parts: kBaseFonts + kLangPackFonts [1], bundled fonts are auto-allowed
// In normal windows: uses the first applicable: RFP over TP over Standard
// In Private Browsing windows: uses the most restrictive between normal and private
// 1=only base system fonts, 2=also fonts from optional language packs, 3=also user-installed fonts
// [1] https://searchfox.org/mozilla-central/search?path=StandardFonts*.inc
// [-] https://bugzilla.mozilla.org/1847599
// user_pref("layout.css.font-visibility.private", 1);
// user_pref("layout.css.font-visibility.standard", 1);
// user_pref("layout.css.font-visibility.trackingprotection", 1);
// 2623: disable permissions delegation [FF73+]
// Currently applies to cross-origin geolocation, camera, mic and screen-sharing
// permissions, and fullscreen requests. Disabling delegation means any prompts
// for these will show/use their correct 3rd party origin
// [1] https://groups.google.com/forum/#!topic/mozilla.dev.platform/BdFOMAuCGW8/discussion
// [-] https://bugzilla.mozilla.org/1697151
// user_pref("permissions.delegation.enabled", false);
// FF119
// 0211: use en-US locale regardless of the system or region locale
// [SETUP-WEB] May break some input methods e.g xim/ibus for CJK languages [1]
// [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=867501,1629630
// [-] https://bugzilla.mozilla.org/1846224
// user_pref("javascript.use_us_english_locale", true); // [HIDDEN PREF]
// 0711: disable skipping DoH when parental controls are enabled [FF70+]
// [-] https://bugzilla.mozilla.org/1586941
user_pref("network.dns.skipTRR-when-parental-control-enabled", false);
// FF123
// 0334: disable PingCentre telemetry (used in several System Add-ons) [FF57+]
// Defense-in-depth: currently covered by 0331
// [-] https://bugzilla.mozilla.org/1868988
user_pref("browser.ping-centre.telemetry", false);
// FF126
// 9003: disable What's New toolbar icon [FF69+]
// [-] https://bugzilla.mozilla.org/1724300
user_pref("browser.messaging-system.whatsNewPanel.enabled", false);
// FF132
// 2617: remove webchannel whitelist
// [-] https://bugzilla.mozilla.org/1275612
// user_pref("webchannel.allowObject.urlWhitelist", "");
// FF140
// 0323: disable shopping experience [FF116+]
// [-] https://bugzilla.mozilla.org/1964845
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1840156#c0
user_pref("browser.shopping.experience2023.enabled", false); // [DEFAULT: false]
// 0806: disable urlbar suggestions
// [-] https://bugzilla.mozilla.org/1959497
user_pref("browser.urlbar.pocket.featureGate", false); // [FF116+] [DEFAULT: false]
// ***/
/* END: internal custom pref to test for syntax errors ***/