140.0 (#404)

* install.py: add shebang

* install.py: remove old version of _get_firefox_version

* install.py: search for Firefox installation, including flatpak version

* install.py: add option to disable 'Press ENTER to exit'

* install.py: fix windows root

Fastfox.js

@@ -254,13 +254,14 @@ user_pref("browser.cache.disk.enable", false);
 // that only contains settings for systems at or below 8GB of system memory [1].
 // Waterfox G6 allows it to go above 8GB machines [3].
 // Value can be up to the max size of an unsigned 64-bit integer.
-// -1=Automatically decide the maximum memory to use to cache decoded images,
+// -1 = Automatically decide the maximum memory to use to cache decoded images,
 // messages, and chrome based on the total amount of RAM
+// For machines with 8GB+ RAM, that equals 32768 kb = 32 MB
 // [1] https://kb.mozillazine.org/Browser.cache.memory.capacity#-1
 // [2] https://searchfox.org/mozilla-central/source/netwerk/cache2/CacheObserver.cpp#94-125
 // [3] https://github.com/WaterfoxCo/Waterfox/commit/3fed16932c80a2f6b37d126fe10aed66c7f1c214
-//user_pref("browser.cache.memory.capacity", -1); // DEFAULT; 256000=256 MB; 512000=500 MB; 1048576=1GB, 2097152=2GB
-//user_pref("browser.cache.memory.max_entry_size", 10240); // (10 MB); default=5120 (5 MB)
+//user_pref("browser.cache.memory.capacity", 131072); // (128 MB)
+//user_pref("browser.cache.memory.max_entry_size", 20480); // (20 MB); default=5120 (5 MB)
 
 // PREF: amount of Back/Forward cached pages stored in memory for each tab
 // Pages that were recently visited are stored in memory in such a way
@@ -271,7 +272,7 @@ user_pref("browser.cache.disk.enable", false);
 // is no reason for Firefox to keep memory for this.
 // -1=determine automatically (8 pages)
 // [1] https://kb.mozillazine.org/Browser.sessionhistory.max_total_viewers#Possible_values_and_their_effects
-//user_pref("browser.sessionhistory.max_total_viewers", 4);
+user_pref("browser.sessionhistory.max_total_viewers", 4);
 
 /****************************************************************************
  * SECTION: MEDIA CACHE                                                     *
@@ -403,7 +404,7 @@ user_pref("network.ssl_tokens_cache_capacity", 10240); // default=2048; more TLS
 // [3] https://searchfox.org/mozilla-central/rev/028c68d5f32df54bca4cf96376f79e48dfafdf08/modules/libpref/init/all.js#1280-1282
 // [4] https://www.keycdn.com/blog/resource-hints#prefetch
 // [5] https://3perf.com/blog/link-rels/#prefetch
-//user_pref("network.http.speculative-parallel-limit", 20); // DEFAULT (FF127+?)
+user_pref("network.http.speculative-parallel-limit", 0);
 
 // PREF: DNS prefetching for HTMLLinkElement <link rel="dns-prefetch">
 // Used for cross-origin connections to provide small performance improvements.
@@ -436,11 +437,11 @@ user_pref("network.dns.disablePrefetch", true);
 // [NOTE] Firefox will perform DNS lookup (if enabled) and TCP and TLS handshake,
 // but will not start sending or receiving HTTP data.
 // [1] https://www.ghacks.net/2017/07/24/disable-preloading-firefox-autocomplete-urls/
-//user_pref("browser.urlbar.speculativeConnect.enabled", false);
+user_pref("browser.urlbar.speculativeConnect.enabled", false);
 
 // PREF: mousedown speculative connections on bookmarks and history [FF98+]
 // Whether to warm up network connections for places:menus and places:toolbar.
-//user_pref("browser.places.speculativeConnect.enabled", false);
+user_pref("browser.places.speculativeConnect.enabled", false);
 
 // PREF: network module preload <link rel="modulepreload"> [FF115+]
 // High-priority loading of current page JavaScript modules.
@@ -498,7 +499,7 @@ user_pref("network.prefetch-next", false);
 // When enabled, it trains and uses Firefox's algorithm to preload page resource
 // by tracking past page resources. It uses a local file (history) of needed images,
 // scripts, etc. to request them preemptively when navigating.
-// [NOTE] By default, it only preconnects, doing DNS, TCP, and SSL handshakes.
+// [NOTE] By default, it only preconnects DNS, TCP, and SSL handshakes.
 // No data sends until clicking. With "network.predictor.enable-prefetch" enabled,
 // it also performs prefetches.
 // [1] https://wiki.mozilla.org/Privacy/Reviews/Necko

Peskyfox.js

@@ -3,7 +3,7 @@
  * Peskyfox                                                                 *
  * "Aquila non capit muscas"                                                *
  * priority: remove annoyances                                              *
- * version: 137                                                             *
+ * version: 140                                                             *
  * url: https://github.com/yokoffing/Betterfox                              *
  * credit: Some prefs are reproduced and adapted from the arkenfox project  *
  * credit urL: https://github.com/arkenfox/user.js                          *
@@ -238,11 +238,13 @@ user_pref("browser.urlbar.trending.featureGate", false);
 //user_pref("browser.urlbar.maxRichResults", 5); // default=10
 
 // PREF: text fragments
+// [WARNING] Enabling can cause tab crashes [4]
 // [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1753933#c6
 // [2] https://developer.mozilla.org/en-US/docs/Web/Text_fragments
 // [3] https://web.dev/articles/text-fragments
+// [4] https://github.com/yokoffing/Betterfox/issues/397
 //user_pref("dom.text_fragments.enabled", true); // [DEFAULT]
-user_pref("dom.text_fragments.create_text_fragment.enabled", true);
+//user_pref("dom.text_fragments.create_text_fragment.enabled", true);
 
 /****************************************************************************
  * SECTION: AUTOPLAY                                                        *

README.md

@@ -48,7 +48,7 @@ The `user.js` — a configuration file that controls Firefox settings — is cur
 * [Zen](https://github.com/zen-browser/desktop?tab=readme-ov-file) | [files](https://github.com/zen-browser/desktop/blob/stable/src/browser/app/profile/zen-browser.js) (July 2024)
 * [Midori](https://github.com/goastian/midori-desktop/blob/ESR115/README.md) | [files](https://github.com/goastian/midori-desktop/blob/f3d8d96eb8e08f35a64e3c957bea4e839d7c7730/floorp/browser/components/userjsUtils.sys.mjs#L28-L33) (Dec 2023?)
 * [Mercury](https://github.com/Alex313031/Mercury/releases/tag/v.115.3.0) | [files](https://github.com/Alex313031/Mercury/commit/eb9600f9fb8f48c8f5b5c6f3264fbcdb5caff7f5) (Sep 2023)
-* [Waterfox](https://www.waterfox.net/en-US/docs/releases/G6.0/) | [files](https://github.com/WaterfoxCo/Waterfox/tree/current/waterfox/browser/app/profile) (Sep 2023)
+* [Waterfox](https://www.waterfox.net/docs/releases/G6.0/) | [files](https://github.com/WaterfoxCo/Waterfox/tree/current/waterfox/browser/app/profile) (Sep 2023)
 * [Floorp](https://github.com/Floorp-Projects/Floorp#-betterfox) <sup>[1](https://github.com/Floorp-Projects/Floorp/issues/233#issuecomment-1543557167) [2](https://blog.ablaze.one/3135/2023-04-01/)</sup> | [files](https://github.com/Floorp-Projects/Floorp/blob/ESR115/floorp/browser/components/preferences/userjs.inc.xhtml) (Apr 2023)
 * [Pulse](https://github.com/pulse-browser/browser#%EF%B8%8F-credits) | [files](https://github.com/pulse-browser/browser/tree/alpha/src/browser/app/profile) (Dec 2021)
 * [Ghostery Private Browser](https://github.com/ghostery/user-agent-desktop#community) <sup>[1](https://web.archive.org/web/20210509171835/https://www.ghostery.com/ghostery-dawn-update-more/) [2](https://web.archive.org/web/20210921114333/https://www.ghostery.com/ghostery-dawn-product-update/)</sup> | [files](https://github.com/ghostery/user-agent-desktop/tree/main/brands/ghostery/branding/pref) (Feb 2021)

Securefox.js

@@ -3,7 +3,7 @@
  * Securefox                                                                *
  * "Natura non contristatur"                                                *     
  * priority: provide sensible security and privacy                          *
- * version: 137                                                             *
+ * version: 140                                                             *
  * url: https://github.com/yokoffing/Betterfox                              *
  * credit: Most prefs are reproduced and adapted from the arkenfox project  *
  * credit urL: https://github.com/arkenfox/user.js                          *
@@ -61,7 +61,7 @@ user_pref("browser.contentblocking.category", "strict"); // [HIDDEN]
 // [2] https://www.youtube.com/watch?v=VE8SrClOTgw
 // [3] https://searchfox.org/mozilla-central/source/browser/extensions/webcompat/data/shims.js
 //user_pref("extensions.webcompat.enable_shims", true); // [HIDDEN] enabled with "Strict"
-//user_pref("extensions.webcompat.smartblockEmbeds.enabled", true); // enabled with "Strict"
+//user_pref("extensions.webcompat.smartblockEmbeds.enabled", true); // [DEFAULT FF137+]
 
 // PREF: allow embedded tweets and reddit posts [FF136+]
 // [TEST - reddit embed] https://www.pcgamer.com/amazing-halo-infinite-bugs-are-already-rolling-in/
@@ -71,6 +71,7 @@ user_pref("browser.contentblocking.category", "strict"); // [HIDDEN]
 // [TEST - truthsocial embed] https://www.newsweek.com/donald-trump-congratulates-patrick-brittany-mahomes-new-baby-2027097
 // [1] https://www.reddit.com/r/firefox/comments/l79nxy/firefox_dev_is_ignoring_social_tracking_preference/gl84ukk
 // [2] https://www.reddit.com/r/firefox/comments/pvds9m/reddit_embeds_not_loading/
+// [3] https://github.com/yokoffing/Betterfox/issues/413
 //user_pref("urlclassifier.trackingSkipURLs", "embed.reddit.com, *.twitter.com, *.twimg.com"); // MANUAL [FF136+]
 //user_pref("urlclassifier.features.socialtracking.skipURLs", "*.twitter.com, *.twimg.com"); // MANUAL [FF136+]
 
@@ -121,6 +122,7 @@ user_pref("browser.contentblocking.category", "strict"); // [HIDDEN]
 // [5] https://hacks.mozilla.org/2021/02/introducing-state-partitioning/
 // [6] https://github.com/arkenfox/user.js/issues/1281
 // [7] https://hacks.mozilla.org/2022/02/improving-the-storage-access-api-in-firefox/
+// [8] https://blog.includesecurity.com/2025/04/cross-site-websocket-hijacking-exploitation-in-2025/
 //user_pref("network.cookie.cookieBehavior", 5); // DEFAULT FF103+
 //user_pref("network.cookie.cookieBehavior.optInPartitioning", true); // [ETP FF132+]
 //user_pref("browser.contentblocking.reject-and-isolate-cookies.preferences.ui.enabled", true); // DEFAULT
@@ -166,6 +168,7 @@ user_pref("browser.contentblocking.category", "strict"); // [HIDDEN]
 // [6] https://web.dev/samesite-cookies-explained/
 // [7] https://portswigger.net/web-security/csrf/bypassing-samesite-restrictions
 // [8] https://developer.mozilla.org/en-US/docs/Web/HTTP/Cookies
+// [9] https://blog.includesecurity.com/2025/04/cross-site-websocket-hijacking-exploitation-in-2025/
 // [TEST] https://samesite-sandbox.glitch.me/
 //user_pref("network.cookie.sameSite.laxByDefault", true);
 //user_pref("network.cookie.sameSite.noneRequiresSecure", true); // [DEFAULT FF131+]
@@ -580,11 +583,13 @@ user_pref("browser.search.separatePrivateDefault.ui.enabled", true);
     //user_pref("browser.search.separatePrivateDefault", true); // DEFAULT
 
 // PREF: enable option to add custom search engine
+// Before FF140, this pref was hidden.
 // [SETTINGS] Settings -> Search -> Search Shortcuts -> Add
 // [EXAMPLE] https://search.brave.com/search?q=%s
 // [EXAMPLE] https://lite.duckduckgo.com/lite/?q=%s
 // [1] https://reddit.com/r/firefox/comments/xkzswb/adding_firefox_search_engine_manually/
-user_pref("browser.urlbar.update2.engineAliasRefresh", true); // HIDDEN
+// [2] https://www.mozilla.org/en-US/firefox/140.0/releasenotes/
+//user_pref("browser.urlbar.update2.engineAliasRefresh", true); // [DEFAULT FF140+]
 
 // PREF: disable live search suggestions (Google, Bing, etc.)
 // [WARNING] Search engines keylog every character you type from the URL bar.
@@ -660,6 +665,7 @@ user_pref("network.IDN_show_punycode", true);
 // [4] https://web.dev/why-https-matters/
 // [5] https://www.cloudflare.com/learning/ssl/why-use-https/
 // [6] https://blog.chromium.org/2023/08/towards-https-by-default.html
+// [7] https://attackanddefense.dev/2025/03/31/https-first-in-firefox-136.html
 //user_pref("dom.security.https_first", true); // [DEFAULT FF136+]
 //user_pref("dom.security.https_first_pbm", true); // [DEFAULT FF91+]
 //user_pref("dom.security.https_first_schemeless", true); // [FF120+] [DEFAULT FF129+]
@@ -887,10 +893,11 @@ user_pref("signon.privateBrowsingCapture.enabled", false);
 
 // PREF: limit (or disable) HTTP authentication credentials dialogs triggered by sub-resources [FF41+]
 // Hardens against potential credentials phishing.
+// [WARNING] Hardening this pref may prevent you from subscribing to SoGo calendars in Thunderbird 138
 // 0=don't allow sub-resources to open HTTP authentication credentials dialogs
 // 1=don't allow cross-origin sub-resources to open HTTP authentication credentials dialogs
 // 2=allow sub-resources to open HTTP authentication credentials dialogs (default)
-// [1] https://www.fxsitecompat.com/en-CA/docs/2015/http-auth-dialog-can-no-longer-be-triggered-by-cross-origin-resources/
+// [1] https://web.archive.org/web/20181123134351/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);
 
 // PREF: prevent password truncation when submitting form data
@@ -1159,6 +1166,10 @@ user_pref("privacy.userContext.ui.enabled", true);
 // [3] https://www.zdnet.com/article/half-of-the-websites-using-webassembly-use-it-for-malicious-purposes
 //user_pref("javascript.options.wasm", false);
 
+// PREF: CSP reporting
+// [1] https://github.com/yokoffing/Betterfox/issues/415
+//user_pref("security.csp.reporting.enabled", false);
+
 /******************************************************************************
  * SECTION: SAFE BROWSING (SB)                                               *
 ******************************************************************************/
@@ -1269,6 +1280,8 @@ user_pref("browser.safebrowsing.downloads.remote.enabled", false);
 // To add site exceptions: Page Info>Permissions>Receive Notifications
 // To manage site exceptions: Options>Privacy & Security>Permissions>Notifications>Settings
 // 0=always ask (default), 1=allow, 2=block
+// [1] https://easylinuxtipsproject.blogspot.com/p/security.html#ID5
+// [2] https://github.com/yokoffing/Betterfox/wiki/Common-Overrides#site-notifications
 user_pref("permissions.default.desktop-notification", 2);
    
 // PREF: default permission for Location Requests
@@ -1322,6 +1335,10 @@ user_pref("permissions.manager.defaultsUrl", "");
 // PREF: remove webchannel whitelist
 //user_pref("webchannel.allowObject.urlWhitelist", ""); // [DEFAULT FF132+]
 
+// PREF: disable metadata caching for installed add-ons by default
+// [1] https://blog.mozilla.org/addons/how-to-opt-out-of-add-on-metadata-updates/
+user_pref("extensions.getAddons.cache.enabled", false);
+
 /******************************************************************************
  * SECTION: TELEMETRY                                                   *
 ******************************************************************************/
@@ -1363,8 +1380,7 @@ user_pref("browser.newtabpage.activity-stream.feeds.telemetry", false);
 user_pref("browser.newtabpage.activity-stream.telemetry", false);
 
 // PREF: disable daily active users [FF136+]
-// [NOTE] Already disabled by main telemetry switch
-//user_pref("datareporting.usage.uploadEnabled", false);
+user_pref("datareporting.usage.uploadEnabled", false);
 
 /******************************************************************************
  * SECTION: EXPERIMENTS                                                      *
@@ -1398,15 +1414,16 @@ user_pref("browser.tabs.crashReporting.sendReport", false);
 ******************************************************************************/
 
 // PREF: disable Captive Portal detection
+// [WARNING] Do NOT use for mobile devices. May NOT be able to use Firefox on public wifi (hotels, coffee shops, etc).
 // [1] https://www.eff.org/deeplinks/2017/08/how-captive-portals-interfere-wireless-security-and-privacy
 // [2] https://wiki.mozilla.org/Necko/CaptivePortal
-user_pref("captivedetect.canonicalURL", "");
-user_pref("network.captive-portal-service.enabled", false);
+//user_pref("captivedetect.canonicalURL", "");
+//user_pref("network.captive-portal-service.enabled", false);
 
 // PREF: disable Network Connectivity checks
 // [WARNING] Do NOT use for mobile devices. May NOT be able to use Firefox on public wifi (hotels, coffee shops, etc).
 // [1] https://bugzilla.mozilla.org/1460537
-user_pref("network.connectivity-service.enabled", false);
+//user_pref("network.connectivity-service.enabled", false);
 
 // PREF: disable Privacy-Preserving Attribution [FF128+]
 // [NOTE] PPA disabled if main telemetry switches are disabled.

install.py

@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 from datetime import datetime
 from os import name, getenv
 from json import loads
@@ -43,23 +45,47 @@ If there's any problems with the script, feel free to mention @Denperidge on Git
 re_find_version = compile(r"mozilla.org/.*?/firefox/(?P<version>[\d.]*?)/", IGNORECASE)
 re_find_overrides = r"(overrides|prefs).*\n(?P<space>\n)"
 
-FIREFOX_ROOT = Path.home().joinpath(".mozilla/firefox").absolute() if name != "nt" else Path(getenv("APPDATA") + "/Mozilla/Firefox/").resolve()
-DEFAULT_FIREFOX_INSTALL = Path("C:/Program Files/Mozilla Firefox/" if name == "nt" else "")
-
-selected_if_backup = None
-selected_config = ""
-userjs_path = None
+INSTALLATIONS_TO_CHECK = [
+    # windows
+    {
+        "command": [str(Path("C:/Program Files/Mozilla Firefox/firefox"))],
+        "root": Path(getenv("APPDATA") or "").joinpath("Mozilla/Firefox").resolve(),
+    },
+    # linux
+    {
+        "command": ["firefox"],
+        "root": Path.home().joinpath(".mozilla/firefox").absolute(),
+    },
+    # flatpak
+    {
+        "command": ["flatpak", "run", "org.mozilla.firefox"],
+        "root": Path.home().joinpath(".var/app/org.mozilla.firefox/.mozilla/firefox").absolute(),
+    },
+]
 
 
-def _get_firefox_version(bin="firefox"):
-    try:
-        ver_string = check_output([bin, "--version"], encoding="UTF-8")
+# command is a list, eg. ["firefox"] or ["flatpak", "run", "org.mozilla.firefox"]
+def _get_firefox_version(command):
+    ver_string = check_output(command + ["--version"], encoding="UTF-8")
     return ver_string[ver_string.rindex(" ")+1:].strip()
-    except FileNotFoundError:
-        return _get_firefox_version(str(DEFAULT_FIREFOX_INSTALL.joinpath("firefox")))
 
-def _get_default_profile_folder():
-    config_path = FIREFOX_ROOT.joinpath("profiles.ini")
+def _get_default_firefox_version_and_root():
+    print("Searching for Firefox installation...")
+    for installation in INSTALLATIONS_TO_CHECK:
+        try:
+            print(f"  '{' '.join(installation['command'])}': ", end="")
+            version = _get_firefox_version(installation["command"])
+            print("YES")
+            print(f"Root: {installation['root']}")
+            return version, installation["root"]
+        except Exception:
+            print("no")
+            continue
+    
+    raise Exception("Firefox binary not found. Please ensure Firefox is installed and the path is correct.")
+
+def _get_default_profile_folder(firefox_root):
+    config_path = firefox_root.joinpath("profiles.ini")
     
     print(f"Reading {config_path}...")
 
@@ -82,7 +108,7 @@ def _get_default_profile_folder():
                 break
     
     if path is not None:
-        return FIREFOX_ROOT.joinpath(path)
+        return firefox_root.joinpath(path)
     else:
         raise Exception("Could not determine default Firefox profile! Exiting...")
 
@@ -123,16 +149,6 @@ def _get_latest_compatible_release(releases):
         if firefox_version in release["supported"]:
             return release
     return None
-def _get_firefox_version(bin="firefox"):
-    try:
-        ver_string = check_output([bin, "--version"], encoding="UTF-8")
-        return ver_string[ver_string.rindex(" ")+1:].strip()
-    except FileNotFoundError:
-        default_path = str(DEFAULT_FIREFOX_INSTALL.joinpath("firefox"))
-        if bin != default_path:  # Avoid infinite recursion
-            return _get_firefox_version(default_path)
-        else:
-            raise Exception("Firefox binary not found. Please ensure Firefox is installed and the path is correct.")    
 
 def backup_profile(src):
     dest = f"{src}-backup-{datetime.today().strftime('%Y-%m-%d-%H-%M-%S')}"
@@ -176,12 +192,15 @@ def list_releases(releases, only_supported=False, add_index=False):
             print(f"{f'[{i}]' if add_index else ''}{'> ' if supported else '  '}{release['name'].ljust(20)}\t\t\tSupported: {','.join(release['supported'])}")
         i+=1
 
+def _press_enter_to_exit(args):
+    if not args.no_wait_for_exit:
+        input("Press ENTER to exit...")
 
 if __name__ == "__main__":
-    firefox_version = _get_firefox_version()
-    selected_release = None
+    firefox_version, firefox_root = _get_default_firefox_version_and_root()
+
+    default_profile_folder = _get_default_profile_folder(firefox_root)
 
-    default_profile_folder = _get_default_profile_folder()
     argparser = ArgumentParser(
 
     )
@@ -203,14 +222,17 @@ if __name__ == "__main__":
     modes.add_argument("--list-all", action="store_true", default=False, help=f"List all Betterfox releases")
     modes.add_argument("--interactive", "-i", action="store_true", default=False, help=f"Interactively select Betterfox version")
 
+    behaviour = argparser.add_argument_group("Script behaviour")
+    behaviour.add_argument("--no-wait-for-exit", "-nwfe", action="store_true", default=False, help="Disable 'Press ENTER to exit...' and exit immediately"),
+
     args = argparser.parse_args()
 
     releases = _get_releases(args.repository_owner, args.repository_name)
-
+    selected_release = None
 
     if args.list or args.list_all:
         list_releases(releases, args.list)
-        input("Press ENTER to exit...")
+        _press_enter_to_exit(args)
         exit()
 
     if not args.no_backup:
@@ -261,5 +283,5 @@ if __name__ == "__main__":
         else:
             print(f"Found no overrides in {args.overrides}")
 
-    input("Press ENTER to exit...")
+    _press_enter_to_exit(args)
 

personal/user-overrides.js

@@ -19,7 +19,16 @@
 
 /** FASTFOX ***/
 user_pref("browser.sessionstore.restore_pinned_tabs_on_demand", true);
-user_pref("browser.sessionhistory.max_total_viewers", 4); // only remember # of pages in Back-Forward cache
+
+// SPECULATIVE LOADING WITHOUT PREDICTOR
+user_pref("network.http.speculative-parallel-limit", 20);
+//user_pref("network.dns.disablePrefetch", false);
+//user_pref("network.dns.disablePrefetchFromHTTPS", false);
+//user_pref("dom.prefetch_dns_for_anchor_https_document", true); 
+user_pref("browser.urlbar.speculativeConnect.enabled", true);
+user_pref("browser.places.speculativeConnect.enabled", true);
+user_pref("network.prefetch-next", true);
+
 user_pref("network.http.max-persistent-connections-per-server", 20); // increase download connections
 
 /** SECUREFOX ***/
@@ -45,6 +54,9 @@ user_pref("identity.fxaccounts.enabled", false); // disable Firefox Sync
 user_pref("browser.firefox-view.feature-tour", "{\"screen\":\"\",\"complete\":true}"); // disable the Firefox View tour from popping up for new profiles
 user_pref("accessibility.force_disabled", 1); // disable Accessibility features
 user_pref("security.cert_pinning.enforcement_level", 2); // strict public key pinning
+user_pref("captivedetect.canonicalURL", ""); // disable captive portal detection
+user_pref("network.captive-portal-service.enabled", false); // disable captive portal detection
+user_pref("network.connectivity-service.enabled", false); // disable captive portal detection
 
 /** PESKYFOX ***/
 user_pref("devtools.accessibility.enabled", false); // removes un-needed "Inspect Accessibility Properties" on right-click

user.js

@@ -10,7 +10,7 @@
 /****************************************************************************
  * Betterfox                                                                *
  * "Ad meliora"                                                             *
- * version: 137                                                             *
+ * version: 140                                                             *
  * url: https://github.com/yokoffing/Betterfox                              *
 ****************************************************************************/
 
@@ -27,6 +27,9 @@ user_pref("gfx.content.skia-font-cache-size", 20);
 /** DISK CACHE ***/
 user_pref("browser.cache.disk.enable", false);
 
+/** MEMORY CACHE ***/
+user_pref("browser.sessionhistory.max_total_viewers", 4);
+
 /** MEDIA CACHE ***/
 user_pref("media.memory_cache_max_size", 65536);
 user_pref("media.cache_readahead_limit", 7200);
@@ -44,11 +47,13 @@ user_pref("network.dnsCacheExpiration", 3600);
 user_pref("network.ssl_tokens_cache_capacity", 10240);
 
 /** SPECULATIVE LOADING ***/
+user_pref("network.http.speculative-parallel-limit", 0);
 user_pref("network.dns.disablePrefetch", true);
 user_pref("network.dns.disablePrefetchFromHTTPS", true);
+user_pref("browser.urlbar.speculativeConnect.enabled", false);
+user_pref("browser.places.speculativeConnect.enabled", false);
 user_pref("network.prefetch-next", false);
 user_pref("network.predictor.enabled", false);
-user_pref("network.predictor.enable-prefetch", false);
 
 /** EXPERIMENTAL ***/
 user_pref("layout.css.grid-template-masonry-value.enabled", true);
@@ -84,7 +89,6 @@ user_pref("privacy.history.custom", true);
 user_pref("browser.urlbar.trimHttps", true);
 user_pref("browser.urlbar.untrimOnUserInteraction.featureGate", true);
 user_pref("browser.search.separatePrivateDefault.ui.enabled", true);
-user_pref("browser.urlbar.update2.engineAliasRefresh", true);
 user_pref("browser.search.suggest.enabled", false);
 user_pref("browser.urlbar.quicksuggest.enabled", false);
 user_pref("browser.urlbar.groupLabels.enabled", false);
@@ -119,6 +123,7 @@ user_pref("permissions.default.geo", 2);
 user_pref("geo.provider.network.url", "https://beacondb.net/v1/geolocate");
 user_pref("browser.search.update", false);
 user_pref("permissions.manager.defaultsUrl", "");
+user_pref("extensions.getAddons.cache.enabled", false);
 
 /** TELEMETRY ***/
 user_pref("datareporting.policy.dataSubmissionEnabled", false);
@@ -137,6 +142,7 @@ user_pref("toolkit.coverage.opt-out", true);
 user_pref("toolkit.coverage.endpoint.base", "");
 user_pref("browser.newtabpage.activity-stream.feeds.telemetry", false);
 user_pref("browser.newtabpage.activity-stream.telemetry", false);
+user_pref("datareporting.usage.uploadEnabled", false);
 
 /** EXPERIMENTS ***/
 user_pref("app.shield.optoutstudies.enabled", false);
@@ -147,11 +153,6 @@ user_pref("app.normandy.api_url", "");
 user_pref("breakpad.reportURL", "");
 user_pref("browser.tabs.crashReporting.sendReport", false);
 
-/** DETECTION ***/
-user_pref("captivedetect.canonicalURL", "");
-user_pref("network.captive-portal-service.enabled", false);
-user_pref("network.connectivity-service.enabled", false);
-
 /****************************************************************************
  * SECTION: PESKYFOX                                                        *
 ****************************************************************************/
@@ -181,7 +182,6 @@ user_pref("full-screen-api.warning.timeout", 0);
 /** URL BAR ***/
 user_pref("browser.urlbar.unitConversion.enabled", true);
 user_pref("browser.urlbar.trending.featureGate", false);
-user_pref("dom.text_fragments.create_text_fragment.enabled", true);
 
 /** NEW TAB PAGE ***/
 user_pref("browser.newtabpage.activity-stream.default.sites", "");

zen/user.js

@@ -10,7 +10,7 @@
 /****************************************************************************
  * BetterZen                                                                *
  * "Ex nihilo nihil fit"                                                    *
- * version: 137                                                             *
+ * version: 138                                                             *
  * url: https://github.com/yokoffing/Betterfox                              *
 ****************************************************************************/
 
@@ -18,7 +18,6 @@
  * SECTION: FASTFOX                                                         *
 ****************************************************************************/
 /** GFX ***/
-user_pref("gfx.canvas.accelerated.cache-items", 8192); // DEFAULT FF135+
 user_pref("gfx.canvas.accelerated.cache-size", 512);
 
 /** DISK CACHE ***/
@@ -91,10 +90,6 @@ user_pref("dom.text_fragments.create_text_fragment.enabled", true);
 ****************************************************************************/
 // Remove the slashes to enable the prefs
 
-// PREF: reduce CPU and GPU use until bug is fixed
-// [1] https://github.com/zen-browser/desktop/issues/6302
-user_pref("zen.view.experimental-rounded-view", false);
-
 // PREF: re-enable Windows efficiency mode
 //user_pref("dom.ipc.processPriorityManager.backgroundUsesEcoQoS", true);
 
@@ -105,6 +100,9 @@ user_pref("zen.view.experimental-rounded-view", false);
 // Currently bugged if you click to view what's blocked
 //user_pref("zen.urlbar.show-protections-icon", true);
 
+// PREF: Disable the Picture in picture pop-out when changing tabs
+//user_pref("media.videocontrols.picture-in-picture.enable-when-switching-tabs.enabled", false);
+
 /****************************************************************************
  * START: MY OVERRIDES                                                      *
 ****************************************************************************/