Update 'user.js'

✅ Synced with Desktop version
✅ Synced all the buildIDs with Tor's ones
✅ Added a pref (commented by default) to set the days before cookies are delated if you choose for:
network.cookie.lifetimePolicy = 3
⛔️ Disabled two more webgl prefs
⛔️ Disabled two more signon prefs
⛔️ Disabled one more extensions.blocklist pref
ℹ️ Commented extensions.lastAppBuildId pref because it's constantly overwritten
ℹ️ Added some links and descriptions
ℹ️ Moved some preferences from FF71+ into deprecated section (keeping them active for ESR68.x)

user.js

@@ -55,7 +55,6 @@ user_pref("browser.newtabpage.activity-stream.feeds.snippets", false); // [DESKT
 // Pref : Disable Activity Stream telemetry
 user_pref("browser.newtabpage.activity-stream.feeds.telemetry", false); // [DESKTOP]
 user_pref("browser.newtabpage.activity-stream.telemetry", false); // [DESKTOP]
-user_pref("browser.newtabpage.activity-stream.telemetry.ping.endpoint", ""); // [DESKTOP]
 user_pref("browser.newtabpage.activity-stream.telemetry.ut.events", false); // [DESKTOP]
 user_pref("browser.newtabpage.activity-stream.telemetry.structuredIngestion", false); // [DESKTOP]
 user_pref("browser.newtabpage.activity-stream.telemetry.structuredIngestion.endpoint", ""); // [DESKTOP]
@@ -288,7 +287,6 @@ user_pref("toolkit.telemetry.shutdownPingSender.enabled", false); // [DESKTOP]
 user_pref("toolkit.telemetry.updatePing.enabled", false); // [DESKTOP]
 user_pref("toolkit.telemetry.bhrPing.enabled", false); // [DESKTOP]
 user_pref("toolkit.telemetry.firstShutdownPing.enabled", false); // [DESKTOP]
-user_pref("toolkit.telemetry.hybridContent.enabled", false); // [DESKTOP]
 user_pref("toolkit.telemetry.previousBuildID", ""); // [DESKTOP]
 user_pref("toolkit.telemetry.prompted", 2); // [DESKTOP]
 user_pref("toolkit.telemetry.rejected", true); // [DESKTOP]
@@ -453,8 +451,8 @@ user_pref("layout.spellcheckDefault", 0); // [DESKTOP]
 // -------------------------------------
 // Pref : Enable Firefox internal pages and disable the related warnings
 user_pref("general.aboutConfig.enable", true);
-user_pref("general.warnOnAboutConfig", false);
+user_pref("general.warnOnAboutConfig", false); // [XUL]
-user_pref("browser.aboutConfig.showWarning", false);  // [DESKTOP]
+user_pref("browser.aboutConfig.showWarning", false);  // [DESKTOP] // [HTML]
 // -------------------------------------
 // Pref : Disable recent Highlights in the Library
 user_pref("browser.library.activity-stream.enabled", false); // [DESKTOP]
@@ -520,8 +518,6 @@ user_pref("startup.homepage_welcome_url.additional", ""); // [DESKTOP]
 user_pref("startup.homepage_override_url", ""); // [DESKTOP]
 user_pref("browser.search.param.yahoo-fr", ""); // [DESKTOP]
 user_pref("privacy.restrict3rdpartystorage.partitionedHosts", "");
-user_pref("network.netlink.route.check.IPv4", "");
-user_pref("network.netlink.route.check.IPv6", "");
 // -------------------------------------
 // Pref : Devtools cleanup
 user_pref("devtools.devices.url", "");
@@ -910,8 +906,11 @@ user_pref("browser.download.hide_plugins_without_extensions", false); // [DESKTO
 user_pref("dom.event.contextmenu.enabled", false);
 // -------------------------------------
 // Pref : Disable website access to clipboard events/content
-// Disabling clipboard events breaks Ctrl+C/X/V copy/cut/paste functionaility in JS-based web applications (Google Docs...)
+// This applies to onCut/onCopy/onPaste events - i.e. it requires interaction with the website
+// [WARNING] If both 'middlemouse.paste' and 'general.autoScroll' are true (at least one is default (false) then enabling this pref can leak clipboard content
 // https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/Preference_reference/dom.event.clipboardevents.enabled
+// https://www.ghacks.net/2014/01/08/block-websites-reading-modifying-clipboard-contents-firefox/
+// https://bugzilla.mozilla.org/1528289
 user_pref("dom.event.clipboardevents.enabled", false);
 // -------------------------------------
 // Pref : Disable "Confirm you want to leave" dialog on page close
@@ -977,8 +976,8 @@ user_pref("dom.targetBlankNoOpener.enabled", true); // [DEFAULT: false]
 // Value taken from Tor Browser for Android
 // https://bugzilla.mozilla.org/show_bug.cgi?id=583181
 user_pref("browser.startup.homepage_override.buildID", "20100101");
-user_pref("extensions.lastAppBuildId", "20190402030101");
+// user_pref("extensions.lastAppBuildId", ""); //  [FENNEC - BUG] Value that is constantly rewritten
-user_pref("media.gmp-manager.buildID", "20190402030101");
+user_pref("media.gmp-manager.buildID", "20200402050101");
 user_pref("browser.sessionstore.upgradeBackup.latestBuildID", ""); // [DESKTOP]
 user_pref("general.buildID.override", "20100101");
 // -------------------------------------
@@ -1022,6 +1021,8 @@ user_pref("webgl.all-angle-options", false);
 user_pref("webgl.allow-immediate-queries", false);
 user_pref("webgl.default-antialias", false);
 user_pref("webgl.enable-surface-texture", false);
+user_pref("webgl.cgl.multithreaded", false);
+user_pref("webgl.dxgl.enabled", false);
 // -------------------------------------
 // Pref : Disable screensharing and audiocapture
 user_pref("media.getusermedia.screensharing.enabled", false); // [DESKTOP]
@@ -1128,7 +1129,6 @@ user_pref("browser.urlbar.usepreloadedtopurls.enabled", false); // [DESKTOP]
 // Pref : Disable Firefox Tips / Search suggestions
 user_pref("browser.urlbar.daysBeforeHidingSuggestionsPrompt", 0); // [DESKTOP]
 user_pref("browser.urlbar.searchSuggestionsChoice", false); // [DESKTOP]
-user_pref("browser.urlbar.timesBeforeHidingSuggestionsHint", 0); // [DESKTOP]
 // -------------------------------------
 // Pref : Disable history/bookmarks/opened pages suggestions dropdown from URL bar
 // [NOTE] This does not cause privacy/leaking issue
@@ -1342,8 +1342,12 @@ user_pref("network.negotiate-auth.allow-insecure-ntlm-v1", false); // [DESKTOP]
 // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
 // Section : HTTPS (SSL/TLS / OCSP / Certs / HPKP / Ciphers)
 // >>>>>>>>>>>>>>>>>>>>
-// Pref : Disable old SSL/TLS "insecure" renegotiation (vulnerable to a MiTM attack)
+// Pref : Require safe negotiation
+// Blocks connections to servers that don't support RFC 5746 as they're potentially vulnerable to a MiTM attack. A server *without* RFC 5746 can be safe from the attack if it disables renegotiations but the problem is that the browser can't know that.
+// Setting this pref to true is the only way for the browser to ensure there will be no unsafe renegotiations on the channel between the browser and the server.
 // https://wiki.mozilla.org/Security:Renegotiation
+// https://tools.ietf.org/html/rfc5746
+// https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3555
 user_pref("security.ssl.require_safe_negotiation", true);
 // -------------------------------------
 // Pref : Control TLS versions with min and max
@@ -1527,9 +1531,10 @@ user_pref("security.ssl3.ecdhe_rsa_rc4_128_sha", false); // [DESKTOP]
 user_pref("security.ssl3.rsa_rc4_128_md5", false); // [DESKTOP]
 user_pref("security.ssl3.rsa_rc4_128_sha", false); // [DESKTOP]
 // -------------------------------------
-// Pref : Warn the user when server doesn't support RFC 5746 ("safe" renegotiation)
+// Pref : Display warning on the padlock for "broken security"
-// https://wiki.mozilla.org/Security:Renegotiation#security.ssl.treat_unsafe_negotiation_as_broken
+// [BUG] Warning padlock not indicated for subresources on a secure page!
-// https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-3555
+// https://wiki.mozilla.org/Security:Renegotiation
+// https://bugzilla.mozilla.org/1353705
 user_pref("security.ssl.treat_unsafe_negotiation_as_broken", true);
 // -------------------------------------
 // Pref : Control "Add Security Exception" dialog on SSL warnings
@@ -1590,6 +1595,8 @@ user_pref("signon.management.page.breachAlertUrl", ""); // [DESKTOP]
 user_pref("signon.management.page.hideMobileFooter", true); // [DESKTOP]
 user_pref("signon.management.page.mobileAndroidURL", ""); // [DESKTOP]
 user_pref("signon.management.page.mobileAppleURL", ""); // [DESKTOP]
+user_pref("signon.management.page.showPasswordSyncNotification", false); // [DESKTOP]
+user_pref("signon.storeSignons", true); // [DESKTOP] (// Disable login manager storage. https://hg.mozilla.org/integration/autoland/rev/300057f0ec79)
 // -------------------------------------
 // Pref : Disable autofilling saved passwords on HTTP pages and show warning
 // https://bugzilla.mozilla.org/buglist.cgi?bug_id=1217152,1319119
@@ -1832,8 +1839,10 @@ user_pref("layout.css.font-loading-api.enabled", false);
 // https://github.com/ghacksuserjs/ghacks-user.js/issues/744
 // user_pref("font.blacklist.underline_offset", "");
 // -------------------------------------
-// Pref : Disable graphite which turned back on by default
+// Pref : Disable graphite
+// [NOTE] Graphite has had many critical security issues in the past
 // https://www.mozilla.org/security/advisories/mfsa2017-15/#CVE-2017-7778
+// https://en.wikipedia.org/wiki/Graphite_(SIL)
 user_pref("gfx.font_rendering.graphite.enabled", false);
 // -------------------------------------
 // Pref : Limit system font exposure to a whitelist [RESTART]
@@ -1853,7 +1862,6 @@ user_pref("plugins.crash.supportUrl", ""); // [DESKTOP]
 // Pref : Set default plugin state (i.e. new plugins on discovery) to never activate
 // 0=disabled, 1=ask to activate, 2=active - you can override individual plugins
 user_pref("plugin.default.state", 0);
-user_pref("plugin.defaultXpi.state", 0);
 // -------------------------------------
 // Pref : Disable scanning for plugins
 user_pref("plugin.scan.plid.all", false); // [WINDOWS] // [DESKTOP]
@@ -1929,11 +1937,11 @@ user_pref("services.blocklist.gfx.collection", "");
 user_pref("services.blocklist.bucket", "");
 user_pref("services.blocklist.addons.signer", ""); // [DESKTOP]
 user_pref("services.blocklist.addons.collection", "");
-// user_pref("extensions.blocklist.level", 2); // [DEFAULT: 2]
 user_pref("extensions.blocklist.lastModified", ""); // [DESKTOP]
 user_pref("extensions.blocklist.itemURL", "");
 user_pref("extensions.blocklist.enabled", false);
 user_pref("extensions.blocklist.detailsURL", "");
+user_pref("extensions.blocklist.useXML", false);
 user_pref("services.settings.security.onecrl.bucket", "");
 user_pref("services.settings.security.onecrl.collection", "");
 user_pref("services.settings.security.onecrl.signer", "");
@@ -2067,8 +2075,6 @@ user_pref("privacy.socialtracking.notification.enabled", false); // [DESKTOP]
 // Pref : Disable PingCentre telemetry (used in several System Add-ons)
 // Currently blocked by 'datareporting.healthreport.uploadEnabled'
 user_pref("browser.ping-centre.telemetry", false); // [DESKTOP]
-user_pref("browser.ping-centre.production.endpoint", ""); // [DESKTOP]
-user_pref("browser.ping-centre.staging.endpoint", ""); // [DESKTOP]
 // -------------------------------------
 // Pref : Disable all the trackingprotection blocked elements by default
 user_pref("browser.contentblocking.features.strict", ""); // [DESKTOP]
@@ -2110,11 +2116,15 @@ user_pref("extensions.formautofill.heuristics.enabled", false); // [DESKTOP]
 // Section : Persistent Storage
 // >>>>>>>>>>>>>>>>>>>>
 // Pref : Delete cookies and site data on close
-// 0=keep until they expire (default), 2=keep until you close Firefox
+// 0=keep until they expire (default),1=Prompt for each cookie, 2=keep until you close Firefox, 3=Accept for N days
 // [NOTE] Use "Cookie AutoDelete" extension to manage your cookies
 // https://addons.mozilla.org/en-US/firefox/addon/cookie-autodelete/
 // user_pref("network.cookie.lifetimePolicy", 2);
 // -------------------------------------
+// Pref : Sets the number of days that the lifetime of cookies should be limited to
+// [NOTE] Only use if network.cookie.lifetimePolicy is set to 3
+// user_pref("network.cookie.lifetime.days", 1); // [DEFAULT: 90]
+// -------------------------------------
 // Pref : Disable 3rd-party cookies and site-data
 // 0=(Allow) cookies and site data, 1=(Block) All third-party cookies, 2=(Block) All cookies, 3=(Block) Cookies from unvisited websites, 4=(Block) Cross-site and social media trackers
 // [NOTE] Can breaks payment gateways
@@ -2141,16 +2151,6 @@ user_pref("network.cookie.same-site.enabled", true); // [DEFAULT: true]
 // You are better off using an extension for more granular control
 // user_pref("dom.storage.enabled", false);
 // -------------------------------------
-// Pref : Disable IndexedDB
-// https://developer.mozilla.org/en-US/docs/IndexedDB
-// https://en.wikipedia.org/wiki/Indexed_Database_API
-// https://wiki.mozilla.org/Security/Reviews/Firefox4/IndexedDB_Security_Review
-// https://github.com/pyllyukko/user.js/issues/8
-// https://github.com/ghacksuserjs/ghacks-user.js/issues/80#issuecomment-294178018
-// https://superuser.com/questions/1250944/how-can-this-website-reidentify-me-even-after-deleting-all-of-my-browsers-histo
-// [NOTE] IndexedDB could be used for tracking purposes, but is required for some add-ons to work (notably uBlock), and breaks almost every webpage so is left enabled
-// user_pref("dom.indexedDB.enabled", false); // [DEFAULT: true]
-// -------------------------------------
 // Pref : Do not download URLs for the offline cache
 user_pref("browser.cache.offline.storage.enable", false);
 user_pref("browser.cache.offline.enable", false);
@@ -2383,6 +2383,7 @@ user_pref("gfx.vr.osvr.clientLibPath", "");
 user_pref("gfx.vr.osvr.commonLibPath", "");
 user_pref("gfx.vr.osvr.utilLibPath", "");
 user_pref("dom.vr.process.enabled", false);
+user_pref("dom.vr.webxr.enabled", false);
 // -------------------------------------
 // Pref : Disable hardware acceleration to reduce graphics fingerprinting
 // [WARNING] Affects text rendering (fonts will look different), impacts video performance, and parts of Quantum that utilize the GPU will also be affected as they are rolled out
@@ -2615,3 +2616,38 @@ user_pref("privacy.socialtracking.notification.enabled", false);
 // -------------------------------------
 // FF72+
 // -------------------------------------
+// Pref : Disable PingCentre telemetry (used in several System Add-ons)
+// https://bugzilla.mozilla.org/show_bug.cgi?id=1597697
+// https://hg.mozilla.org/mozilla-central/rev/7fcdfe9a24e4
+user_pref("browser.ping-centre.production.endpoint", "");
+user_pref("browser.ping-centre.staging.endpoint", "");
+user_pref("browser.newtabpage.activity-stream.telemetry.ping.endpoint", "");
+// -------------------------------------
+// Pref : Disable Firefox Tips / Search suggestions
+// https://bugzilla.mozilla.org/show_bug.cgi?id=1525296
+// https://hg.mozilla.org/mozilla-central/rev/0fb16f92be6f
+user_pref("browser.urlbar.timesBeforeHidingSuggestionsHint", 0);
+// -------------------------------------
+// Pref : Block unwanted connections
+// https://bugzilla.mozilla.org/show_bug.cgi?id=1593693
+// https://hg.mozilla.org/mozilla-central/rev/ca070ea1fc32
+user_pref("network.netlink.route.check.IPv4", "");
+user_pref("network.netlink.route.check.IPv6", "");
+// -------------------------------------
+// Pref : Set default plugin state (i.e. new plugins on discovery) to never activate
+// https://bugzilla.mozilla.org/show_bug.cgi?id=1596090
+// https://hg.mozilla.org/mozilla-central/rev/df333402f126
+user_pref("plugin.defaultXpi.state", 0);
+// -------------------------------------
+// Pref : Disable Telemetry
+// https://bugzilla.mozilla.org/1520491
+// https://hg.mozilla.org/mozilla-central/rev/76b117a14bca
+user_pref("toolkit.telemetry.hybridContent.enabled", false);
+// -------------------------------------
+// Pref : Disable IndexedDB
+// https://bugzilla.mozilla.org/1488583
+// https://hg.mozilla.org/mozilla-central/rev/c2ab1dc00f21
+// user_pref("dom.indexedDB.enabled", false);
+// -------------------------------------
+// FF73+
+// -------------------------------------