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Thorin-OakenpantsThorin-Oakenpants
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v140.1 (#2013)
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‎user.js‎

Lines changed: 36 additions & 22 deletions
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
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/******
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* name: arkenfox user.js
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* date: 14 August 2025
3+
* date: 4 November 2025
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* version: 140
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* urls: https://github.com/arkenfox/user.js [repo]
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* : https://arkenfox.github.io/gui/ [interactive]
@@ -23,6 +23,7 @@
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[SETUP-SECURITY] it's one item, read it
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[SETUP-WEB] can cause some websites to break
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[SETUP-CHROME] changes how Firefox itself behaves (i.e. not directly website related)
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[SETUP-HARDEN] prefs you may like to add to overrides
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6. Override Recipes: https://github.com/arkenfox/user.js/issues/1080
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* RELEASES: https://github.com/arkenfox/user.js/releases
@@ -83,7 +84,7 @@ user_pref("browser.aboutConfig.showWarning", false);
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user_pref("_user.js.parrot", "0100 syntax error: the parrot's dead!");
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/* 0102: set startup page [SETUP-CHROME]
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* 0=blank, 1=home, 2=last visited page, 3=resume previous session
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* [NOTE] Session Restore is cleared with history (2811+), and not used in Private Browsing mode
87+
* [NOTE] Session Restore is cleared if history is also cleared (2811+), and not used in Private Browsing mode
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* [SETTING] General>Startup>Restore previous session ***/
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user_pref("browser.startup.page", 0);
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/* 0103: set HOME+NEWWINDOW page
@@ -292,7 +293,7 @@ user_pref("browser.urlbar.yelp.featureGate", false); // [FF124+]
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/* 0807: disable urlbar clipboard suggestions [FF118+] ***/
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// user_pref("browser.urlbar.clipboard.featureGate", false);
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/* 0808: disable recent searches [FF120+]
295-
* [NOTE] Recent searches are cleared with history (2811+)
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* [NOTE] Recent searches are cleared if history is cleared (2811+)
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* [1] https://support.mozilla.org/kb/search-suggestions-firefox ***/
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// user_pref("browser.urlbar.recentsearches.featureGate", false);
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/* 0810: disable search and form history
@@ -309,7 +310,7 @@ user_pref("browser.formfill.enable", false);
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/* 0820: disable coloring of visited links
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* [SETUP-HARDEN] Bulk rapid history sniffing was mitigated in 2010 [1][2]. Slower and more expensive
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* redraw timing attacks were largely mitigated in FF77+ [3]. Using RFP (4501) further hampers timing
312-
* attacks. Don't forget clearing history on exit (2811+). However, social engineering [2#limits][4][5]
313+
* attacks. History can also be cleared on exit (2811+). However, social engineering [2#limits][4][5]
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* and advanced targeted timing attacks could still produce usable results
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* [1] https://developer.mozilla.org/docs/Web/CSS/Privacy_and_the_:visited_selector
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* [2] https://dbaron.org/mozilla/visited-privacy
@@ -621,7 +622,12 @@ user_pref("browser.contentblocking.category", "strict"); // [HIDDEN PREF]
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* [3] https://developer.mozilla.org/docs/Web/Privacy/State_Partitioning#storage_access_heuristics ***/
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// user_pref("privacy.antitracking.enableWebcompat", false);
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/*** [SECTION 2800]: SHUTDOWN & SANITIZING ***/
625+
/*** [SECTION 2800]: SHUTDOWN & SANITIZING
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We enable sanitizeOnShutdown to help prevent 1st party website tracking across sessions.
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We consider history/downloads, which are not accessible to websites, as orthogonal and exempt these
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629+
[SETUP-HARDEN] to clear all history/downloads on close, add the appropriate overrides from 2800's
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***/
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user_pref("_user.js.parrot", "2800 syntax error: the parrot's bleedin' demised!");
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/* 2810: enable Firefox to clear items on shutdown
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* [NOTE] In FF129+ clearing "siteSettings" on shutdown (2811+), or manually via site data (2820+) and
@@ -632,11 +638,11 @@ user_pref("privacy.sanitize.sanitizeOnShutdown", true);
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/** SANITIZE ON SHUTDOWN: IGNORES "ALLOW" SITE EXCEPTIONS ***/
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/* 2811: set/enforce clearOnShutdown items (if 2810 is true) [SETUP-CHROME] [FF128+] ***/
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user_pref("privacy.clearOnShutdown_v2.cache", true); // [DEFAULT: true]
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user_pref("privacy.clearOnShutdown_v2.historyFormDataAndDownloads", true); // [DEFAULT: true]
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user_pref("privacy.clearOnShutdown_v2.historyFormDataAndDownloads", false); // [DEFAULT: true]
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// user_pref("privacy.clearOnShutdown_v2.siteSettings", false); // [DEFAULT: false]
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/* 2812: set/enforce clearOnShutdown items [FF136+] ***/
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user_pref("privacy.clearOnShutdown_v2.browsingHistoryAndDownloads", true); // [DEFAULT: true]
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user_pref("privacy.clearOnShutdown_v2.downloads", true); // [HIDDEN]
644+
user_pref("privacy.clearOnShutdown_v2.browsingHistoryAndDownloads", false); // [DEFAULT: true]
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user_pref("privacy.clearOnShutdown_v2.downloads", false); // [HIDDEN]
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user_pref("privacy.clearOnShutdown_v2.formdata", true);
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/* 2813: set Session Restore to clear on shutdown (if 2810 is true) [FF34+]
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* [NOTE] Not needed if Session Restore is not used (0102) or it is already cleared with history (2811+)
@@ -658,10 +664,10 @@ user_pref("privacy.clearOnShutdown_v2.cookiesAndStorage", true);
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* [SETTING] Privacy & Security>Browser Privacy>Cookies and Site Data>Clear Data ***/
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user_pref("privacy.clearSiteData.cache", true);
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user_pref("privacy.clearSiteData.cookiesAndStorage", false); // keep false until it respects "allow" site exceptions
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user_pref("privacy.clearSiteData.historyFormDataAndDownloads", true);
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user_pref("privacy.clearSiteData.historyFormDataAndDownloads", false);
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// user_pref("privacy.clearSiteData.siteSettings", false);
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/* 2821: set manual "Clear Data" items [FF136+] ***/
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user_pref("privacy.clearSiteData.browsingHistoryAndDownloads", true);
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user_pref("privacy.clearSiteData.browsingHistoryAndDownloads", false);
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user_pref("privacy.clearSiteData.formdata", true);
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/** SANITIZE HISTORY: IGNORES "ALLOW" SITE EXCEPTIONS ***/
@@ -670,10 +676,10 @@ user_pref("privacy.clearSiteData.formdata", true);
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* [SETTING] Privacy & Security>History>Custom Settings>Clear History ***/
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user_pref("privacy.clearHistory.cache", true); // [DEFAULT: true]
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user_pref("privacy.clearHistory.cookiesAndStorage", false);
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user_pref("privacy.clearHistory.historyFormDataAndDownloads", true); // [DEFAULT: true]
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user_pref("privacy.clearHistory.historyFormDataAndDownloads", false); // [DEFAULT: true]
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// user_pref("privacy.clearHistory.siteSettings", false); // [DEFAULT: false]
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/* 2831: set manual "Clear History" items [FF136+] ***/
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user_pref("privacy.clearHistory.browsingHistoryAndDownloads", true); // [DEFAULT: true]
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user_pref("privacy.clearHistory.browsingHistoryAndDownloads", false); // [DEFAULT: true]
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user_pref("privacy.clearHistory.formdata", true);
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/** SANITIZE MANUAL: TIMERANGE ***/
@@ -701,10 +707,10 @@ user_pref("privacy.sanitize.timeSpan", 0);
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https://searchfox.org/mozilla-central/search?path=StandardFonts*.inc
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1858181 - subtly randomize canvas per eTLD+1, per session and per window-mode (FF120+)
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1887682 - use fdlibm's sin, cos and tan in jsmath (FF134+)
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1978414 - various (FF143+)
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1954194: available screen resolution: return a fixed offset height from screen per platform when not full screen
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1978414: hardwareConcurrency: return 2 (existing RFPTarget)
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1977836: maxTouchPoints: return multi-touch as 5
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1954194 - available screen resolution: return a fixed offset height from screen per platform when not full screen (FF143+)
711+
1984333 - hardwareConcurrency: less than 8 return 4 else return 8 (FF143+)
712+
1977836 - maxTouchPoints: return multi-touch as 5 (FF143+)
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1917607 - subtly randomize WebGL's readPixels (FF145+)
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***/
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user_pref("_user.js.parrot", "4000 syntax error: the parrot's bereft of life!");
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/* 4001: enable FPP in PB mode [FF114+]
@@ -736,7 +742,6 @@ user_pref("_user.js.parrot", "4000 syntax error: the parrot's bereft of life!");
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[WARNING] DO NOT USE extensions to alter RFP protected metrics
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418986 - limit window.screen & CSS media queries (FF41)
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1360039 - spoof navigator.hardwareConcurrency as 2 (FF55)
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FF56
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1333651 - spoof User Agent & Navigator API
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JS: spoofed as Windows 10, OS X 10.15, Android 10, or Linux
@@ -761,7 +766,10 @@ user_pref("_user.js.parrot", "4000 syntax error: the parrot's bereft of life!");
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Modifier events suppressed are SHIFT and both ALT keys. Chrome is not affected.
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1459089 - disable OS locale in HTTP Accept-Language headers (ANDROID) (FF62)
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1479239 - return "no-preference" with prefers-reduced-motion (FF63)
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1363508 & 1826051 - spoof/suppress Pointer Events (FF64, FF132)
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1363508 & 1826051 & 1957658 - spoof/suppress Pointer Events, spoof maxTouchPoints (FF64, FF132, FF143, ESR140.2)
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FF64: maxTouchPoints: 0 = desktop
771+
FF132: maxTouchPoints: 0 = mac | 10 = windows, linux, mobile
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FF143/140.2: maxTouchPoints: 0 = mac, linux | 10 = windows | 5 = mobile
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1492766 - spoof pointerEvent.pointerid (FF65)
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1485266 - disable exposure of system colors to CSS or canvas (FF67)
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1494034 - return "light" with prefers-color-scheme (FF67)
@@ -778,6 +786,7 @@ user_pref("_user.js.parrot", "4000 syntax error: the parrot's bereft of life!");
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1794628 - return "none" with inverted-colors (FF114)
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1787790 - normalize system fonts (FF128)
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1835987 - spoof timezone as Atlantic/Reykjavik (previously FF55+ was UTC) (FF128)
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1656377 - spoof pointerEvents azimuthAngle and altitudeAngle (FF131)
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1834307 - always use smooth scrolling (FF132)
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1918202 - spoof screen orientation based on spoofed screen size and platform (FF132)
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previously FF50+ it always returned landscape-primary and an angle of 0
@@ -791,7 +800,9 @@ user_pref("_user.js.parrot", "4000 syntax error: the parrot's bereft of life!");
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1781277 - return 10GiB for storage estimate until persistent-storage granted (FF142, ESR140.1)
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1972600 - spoof network connection for HTMLMediaElement preload (FF142, ESR140.1)
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1975851 - return true for navigator.onLine (FF142, ESR140.1)
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1973265 - disable WebCodecs API (FF142?)
803+
1973265 - disable WebCodecs API (FF142)
804+
1984333 - spoof navigator.hardwareConcurrency as 4 except mac return 8 (FF143+)
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previously FF55+ it returned 2
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***/
796807
user_pref("_user.js.parrot", "4500 syntax error: the parrot's popped 'is clogs");
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/* 4501: enable RFP
@@ -833,9 +844,10 @@ user_pref("privacy.resistFingerprinting.block_mozAddonManager", true);
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user_pref("privacy.spoof_english", 1);
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/* 4507: skip browser.startup.blankWindow if RFP is used [FF136+] ***/
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// user_pref("privacy.resistFingerprinting.skipEarlyBlankFirstPaint", true); // [DEFAULT: true]
836-
/* 4510: disable using system colors
837-
* [SETTING] General>Language and Appearance>Fonts and Colors>Colors>Use system colors ***/
838-
user_pref("browser.display.use_system_colors", false); // [DEFAULT: false NON-WINDOWS]
847+
/* 4510: enforce Contrast Control off [FF138+]
848+
* 0=automatic, 1=off, 2=custom
849+
* [SETTING] General>Language and Appearance>Contrast Control ***/
850+
// user_pref("browser.display.document_color_use", 1); // [DEFAULT: 1 NON-WINDOWS]
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/* 4511: disable using system accent colors ***/
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user_pref("widget.non-native-theme.use-theme-accent", false); // [DEFAULT: false WINDOWS]
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/* 4512: enforce links targeting new windows to open in a new tab instead
@@ -1049,6 +1061,8 @@ user_pref("extensions.quarantinedDomains.enabled", true); // [DEFAULT: true]
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// user_pref("privacy.cpd.history", "");
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// user_pref("privacy.cpd.offlineApps", "");
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// user_pref("privacy.cpd.sessions", "");
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/* 6051: prefsCleaner: reset previously active items removed from arkenfox FF140+ ***/
1065+
// user_pref("browser.display.use_system_colors", "");
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10531067
/*** [SECTION 7000]: DON'T BOTHER ***/
10541068
user_pref("_user.js.parrot", "7000 syntax error: the parrot's pushing up daisies!");

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