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@ -1,13 +1,13 @@
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/******
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* name: ghacks user.js
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* date: 15 February 2020
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* version 73-beta
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* date: 24 May 2020
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* version 76
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* authors: v52+ github | v51- www.ghacks.net
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* url: https://github.com/ghacksuserjs/ghacks-user.js
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* license: MIT: https://github.com/ghacksuserjs/ghacks-user.js/blob/master/LICENSE.txt
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* releases: These are end-of-stable-life-cycle legacy archives.
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*Always* use the master branch user.js for a current up-to-date version.
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*Always* use the master branch user.js for a current up-to-date version
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url: https://github.com/ghacksuserjs/ghacks-user.js/releases
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* README:
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@ -150,20 +150,14 @@ user_pref("_user.js.parrot", "0200 syntax error: the parrot's definitely decease
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* [SETTING] to add site exceptions: Page Info>Permissions>Access Your Location
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* [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Location>Settings ***/
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// user_pref("permissions.default.geo", 2);
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/* 0203: use Mozilla geolocation service instead of Google when geolocation is enabled
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/* 0203: use Mozilla geolocation service instead of Google when geolocation is enabled [FF74+]
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* Optionally enable logging to the console (defaults to false) ***/
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user_pref("geo.wifi.uri", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
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// user_pref("geo.wifi.logging.enabled", true); // [HIDDEN PREF]
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user_pref("geo.provider.network.url", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
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// user_pref("geo.provider.network.logging.enabled", true); // [HIDDEN PREF]
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/* 0204: disable using the OS's geolocation service ***/
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user_pref("geo.provider.ms-windows-location", false); // [WINDOWS]
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user_pref("geo.provider.use_corelocation", false); // [MAC]
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user_pref("geo.provider.use_gpsd", false); // [LINUX]
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/* 0205: disable GeoIP-based search results
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* [NOTE] May not be hidden if Firefox has changed your settings due to your locale
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* [1] https://trac.torproject.org/projects/tor/ticket/16254
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* [2] https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_geolocation-for-default-search-engine ***/
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user_pref("browser.search.region", "US"); // [HIDDEN PREF]
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user_pref("browser.search.geoip.url", "");
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/* 0206: disable geographically specific results/search engines e.g. "browser.search.*.US"
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* i.e. ignore all of Mozilla's various search engines in multiple locales ***/
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user_pref("browser.search.geoSpecificDefaults", false);
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@ -174,7 +168,9 @@ user_pref("browser.search.geoSpecificDefaults.url", "");
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* [TEST] https://addons.mozilla.org/about ***/
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user_pref("intl.accept_languages", "en-US, en");
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/* 0211: enforce US English locale regardless of the system locale
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* [1] https://bugzilla.mozilla.org/867501 ***/
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* [SETUP-WEB] May break some input methods e.g xim/ibus for CJK languages, see [2]
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* [1] https://bugzilla.mozilla.org/867501
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* [2] https://bugzilla.mozilla.org/1629630 ***/
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user_pref("javascript.use_us_english_locale", true); // [HIDDEN PREF]
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/* 0212: enforce fallback text encoding to match en-US
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* When the content or server doesn't declare a charset the browser will
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@ -204,8 +200,8 @@ user_pref("app.update.auto", false);
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* [SETTING] about:addons>Extensions>[cog-wheel-icon]>Update Add-ons Automatically (toggle) ***/
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// user_pref("extensions.update.autoUpdateDefault", false);
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/* 0306: disable extension metadata
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* used when installing/updating an extension, and in daily background update checks: if false, it
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* hides the expanded text description (if it exists) when you "show more details about an addon" ***/
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* used when installing/updating an extension, and in daily background update checks:
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* when false, extension detail tabs will have no description ***/
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// user_pref("extensions.getAddons.cache.enabled", false);
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/* 0308: disable search engine updates (e.g. OpenSearch)
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* [NOTE] This does not affect Mozilla's built-in or Web Extension search engines
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@ -276,12 +272,10 @@ user_pref("network.connectivity-service.enabled", false);
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/*** [SECTION 0400]: BLOCKLISTS / SAFE BROWSING (SB) ***/
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user_pref("_user.js.parrot", "0400 syntax error: the parrot's passed on!");
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/** BLOCKLISTS ***/
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/* 0401: enforce Firefox blocklist, but sanitize blocklist url
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/* 0401: enforce Firefox blocklist
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* [NOTE] It includes updates for "revoked certificates"
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* [1] https://blog.mozilla.org/security/2015/03/03/revoking-intermediate-certificates-introducing-onecrl/
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* [2] https://trac.torproject.org/projects/tor/ticket/16931 ***/
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* [1] https://blog.mozilla.org/security/2015/03/03/revoking-intermediate-certificates-introducing-onecrl/ ***/
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user_pref("extensions.blocklist.enabled", true); // [DEFAULT: true]
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user_pref("extensions.blocklist.url", "https://blocklists.settings.services.mozilla.com/v1/blocklist/3/%APP_ID%/%APP_VERSION%/");
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/** SAFE BROWSING (SB)
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Safe Browsing has taken many steps to preserve privacy. *IF* required, a full url is never
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@ -396,7 +390,7 @@ user_pref("_user.js.parrot", "0700 syntax error: the parrot's given up the ghost
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/* 0701: disable IPv6
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* IPv6 can be abused, especially regarding MAC addresses. They also do not play nice
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* with VPNs. That's even assuming your ISP and/or router and/or website can handle it.
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* Firefox telemetry (April 2019) shows only 5% of all connections are IPv6.
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* Firefox telemetry (April 2019) shows only 5% of all connections are IPv6
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* [NOTE] This is just an application level fallback. Disabling IPv6 is best done at an
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* OS/network level, and/or configured properly in VPN setups. If you are not masking your IP,
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* then this won't make much difference. If you are masking your IP, then it can only help.
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@ -596,6 +590,10 @@ user_pref("browser.cache.disk.enable", false);
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* [NOTE] This means any permission changes are session only
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* [1] https://bugzilla.mozilla.org/967812 ***/
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// user_pref("permissions.memory_only", true); // [HIDDEN PREF]
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/* 1007: disable media cache from writing to disk in Private Browsing
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* [NOTE] MSE (Media Source Extensions) are already stored in-memory in PB */
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user_pref("browser.privatebrowsing.forceMediaMemoryCache", true); // [FF75+]
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user_pref("media.memory_cache_max_size", 16384);
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/** SESSIONS & SESSION RESTORE ***/
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/* 1020: exclude "Undo Closed Tabs" in Session Restore ***/
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@ -654,11 +652,13 @@ user_pref("security.ssl.require_safe_negotiation", true);
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/* 1202: control TLS versions with min and max
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* 1=TLS 1.0, 2=TLS 1.1, 3=TLS 1.2, 4=TLS 1.3
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* [WARNING] Leave these at default, otherwise you alter your TLS fingerprint.
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* Firefox telemetry (April 2019) shows only 0.5% of TLS web traffic uses 1.0 or 1.1
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* Firefox telemetry (April 2020) shows only 0.25% of TLS web traffic uses 1.0 or 1.1
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* [1] https://www.ssllabs.com/ssl-pulse/ ***/
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// user_pref("security.tls.version.min", 3);
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// user_pref("security.tls.version.max", 4);
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/* 1203: disable SSL session tracking [FF36+]
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/* 1203: enforce TLS 1.0 and 1.1 downgrades as session only */
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user_pref("security.tls.version.enable-deprecated", false);
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/* 1204: disable SSL session tracking [FF36+]
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* SSL Session IDs are unique, last up to 24hrs in Firefox, and can be used for tracking
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* [SETUP-PERF] Relax this if you have FPI enabled (see 4000) *AND* you understand the
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* consequences. FPI isolates these, but it was designed with the Tor protocol in mind,
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@ -667,12 +667,12 @@ user_pref("security.ssl.require_safe_negotiation", true);
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* [2] https://bugzilla.mozilla.org/967977
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* [3] https://arxiv.org/abs/1810.07304 ***/
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user_pref("security.ssl.disable_session_identifiers", true); // [HIDDEN PREF]
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/* 1204: disable SSL Error Reporting
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/* 1205: disable SSL Error Reporting
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* [1] https://firefox-source-docs.mozilla.org/browser/base/sslerrorreport/preferences.html ***/
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user_pref("security.ssl.errorReporting.automatic", false);
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user_pref("security.ssl.errorReporting.enabled", false);
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user_pref("security.ssl.errorReporting.url", "");
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/* 1205: disable TLS1.3 0-RTT (round-trip time) [FF51+]
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/* 1206: disable TLS1.3 0-RTT (round-trip time) [FF51+]
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* [1] https://github.com/tlswg/tls13-spec/issues/1001
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* [2] https://blog.cloudflare.com/tls-1-3-overview-and-q-and-a/ ***/
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user_pref("security.tls.enable_0rtt_data", false);
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@ -736,6 +736,10 @@ user_pref("security.mixed_content.block_display_content", true);
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/* 1243: block unencrypted requests from Flash on encrypted pages to mitigate MitM attacks [FF59+]
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* [1] https://bugzilla.mozilla.org/1190623 ***/
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user_pref("security.mixed_content.block_object_subrequest", true);
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/* 1244: enable https-only-mode [FF76+]
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* [NOTE] This is experimental
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* [1] https://bugzilla.mozilla.org/1613063 */
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// user_pref("dom.security.https_only_mode", true);
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/** CIPHERS [WARNING: do not meddle with your cipher suite: see the section 1200 intro] ***/
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/* 1261: disable 3DES (effective key size < 128)
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@ -777,7 +781,7 @@ user_pref("security.insecure_connection_text.enabled", true); // [FF60+]
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user_pref("_user.js.parrot", "1400 syntax error: the parrot's bereft of life!");
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/* 1401: disable websites choosing fonts (0=block, 1=allow)
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* This can limit most (but not all) JS font enumeration which is a high entropy fingerprinting vector
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* [SETUP-WEB] Disabling fonts can uglify the web a fair bit.
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* [SETUP-WEB] Can break some PDFs (missing text). Limiting to default fonts can "uglify" the web
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* [SETTING] General>Language and Appearance>Fonts & Colors>Advanced>Allow pages to choose... ***/
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user_pref("browser.display.use_document_fonts", 0);
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/* 1403: disable icon fonts (glyphs) and local fallback rendering
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@ -867,10 +871,10 @@ user_pref("privacy.userContext.ui.enabled", true);
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/* 1702: enable Container Tabs [FF50+]
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* [SETTING] General>Tabs>Enable Container Tabs ***/
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user_pref("privacy.userContext.enabled", true);
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/* 1704: set behaviour on "+ Tab" button to display container menu [FF53+] [SETUP-CHROME]
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* 0=no menu (default), 1=show when clicked, 2=show on long press
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* [1] https://bugzilla.mozilla.org/1328756 ***/
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user_pref("privacy.userContext.longPressBehavior", 2);
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/* 1703: set behaviour on "+ Tab" button to display container menu on left click [FF74+]
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* [NOTE] The menu is always shown on long press and right click
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* [SETTING] General>Tabs>Enable Container Tabs>Settings>Select a container for each new tab ***/
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// user_pref("privacy.userContext.newTabContainerOnLeftClick.enabled", true);
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/*** [SECTION 1800]: PLUGINS ***/
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user_pref("_user.js.parrot", "1800 syntax error: the parrot's pushing up daisies!");
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@ -918,7 +922,6 @@ user_pref("webgl.disabled", true);
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user_pref("webgl.enable-webgl2", false);
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/* 2012: limit WebGL ***/
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user_pref("webgl.min_capability_mode", true);
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user_pref("webgl.disable-extensions", true);
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user_pref("webgl.disable-fail-if-major-performance-caveat", true);
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/* 2022: disable screensharing ***/
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user_pref("media.getusermedia.screensharing.enabled", false);
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@ -1026,14 +1029,14 @@ user_pref("_user.js.parrot", "2400 syntax error: the parrot's kicked the bucket!
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/* 2401: disable website control over browser right-click context menu
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* [NOTE] Shift-Right-Click will always bring up the browser right-click context menu ***/
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// user_pref("dom.event.contextmenu.enabled", false);
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/* 2402: disable website access to clipboard events/content
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* [SETUP-WEB] This will break some sites functionality such as pasting into facebook, wordpress
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/* 2402: disable website access to clipboard events/content [SETUP-HARDEN]
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* [NOTE] This will break some sites' functionality e.g. Outlook, Twitter, Facebook, Wordpress
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* This applies to onCut/onCopy/onPaste events - i.e. it requires interaction with the website
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* [WARNING] If both 'middlemouse.paste' and 'general.autoScroll' are true (at least one
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* is default false) then enabling this pref can leak clipboard content, see [2]
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* [1] https://www.ghacks.net/2014/01/08/block-websites-reading-modifying-clipboard-contents-firefox/
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* [2] https://bugzilla.mozilla.org/1528289 */
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user_pref("dom.event.clipboardevents.enabled", false);
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// user_pref("dom.event.clipboardevents.enabled", false);
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/* 2404: disable clipboard commands (cut/copy) from "non-privileged" content [FF41+]
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* this disables document.execCommand("cut"/"copy") to protect your clipboard
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* [1] https://bugzilla.mozilla.org/1170911 ***/
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@ -1053,11 +1056,14 @@ user_pref("dom.vibrator.enabled", false);
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* [5] https://www.mozilla.org/security/advisories/mfsa2017-05/#CVE-2017-5400
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* [6] https://rh0dev.github.io/blog/2017/the-return-of-the-jit/ ***/
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user_pref("javascript.options.asmjs", false);
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/* 2421: disable Ion and baseline JIT to help harden JS against exploits
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* [WARNING] If false, causes the odd site issue and there is also a performance loss
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/* 2421: disable Ion and baseline JIT to harden against JS exploits [SETUP-HARDEN]
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* [NOTE] In FF75+, when **both** Ion and JIT are disabled, **and** the new
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* hidden pref is enabled, then Ion can still be used by extensions (1599226)
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* [WARNING] Disabling Ion/JIT can cause some site issues and performance loss
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* [1] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-0817 ***/
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// user_pref("javascript.options.ion", false);
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// user_pref("javascript.options.baselinejit", false);
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// user_pref("javascript.options.jit_trustedprincipals", true); // [FF75+] [HIDDEN PREF]
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/* 2422: disable WebAssembly [FF52+] [SETUP-PERF]
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* [NOTE] In FF71+ this no longer affects extensions (1576254)
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* [1] https://developer.mozilla.org/docs/WebAssembly ***/
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@ -1128,7 +1134,7 @@ user_pref("browser.pagethumbnails.capturing_disabled", true); // [HIDDEN PREF]
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/* 2605: block web content in file processes [FF55+]
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* [SETUP-WEB] You may want to disable this for corporate or developer environments
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* [1] https://bugzilla.mozilla.org/1343184 ***/
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user_pref("browser.tabs.remote.allowLinkedWebInFileUriProcess", false);
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user_pref("browser.tabs.remote.allowLinkedWebInFileUriProcess", false); // [DEFAULT: false FF76+]
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/* 2606: disable UITour backend so there is no chance that a remote page can use it ***/
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user_pref("browser.uitour.enabled", false);
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user_pref("browser.uitour.url", "");
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@ -1187,6 +1193,15 @@ user_pref("pdfjs.disabled", false); // [DEFAULT: false]
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/* 2621: disable links launching Windows Store on Windows 8/8.1/10 [WINDOWS]
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* [1] https://www.ghacks.net/2016/03/25/block-firefox-chrome-windows-store/ ***/
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user_pref("network.protocol-handler.external.ms-windows-store", false);
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/* 2622: enforce no system colors; they can be fingerprinted
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* [SETTING] General>Language and Appearance>Fonts and Colors>Colors>Use system colors ***/
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user_pref("browser.display.use_system_colors", false); // [DEFAULT: false]
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/* 2623: disable permissions delegation [FF73+]
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* Currently applies to cross-origin geolocation, camera, mic and screen-sharing
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* permissions, and fullscreen requests. Disabling delegation means any prompts
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* for these will show/use their correct 3rd party origin
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* [1] https://groups.google.com/forum/#!topic/mozilla.dev.platform/BdFOMAuCGW8/discussion */
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user_pref("permissions.delegation.enabled", false);
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/** DOWNLOADS ***/
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/* 2650: discourage downloading to desktop
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@ -1216,7 +1231,7 @@ user_pref("browser.download.hide_plugins_without_extensions", false);
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* [1] archived: https://archive.is/DYjAM ***/
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user_pref("extensions.enabledScopes", 5); // [HIDDEN PREF]
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user_pref("extensions.autoDisableScopes", 15); // [DEFAULT: 15]
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/* 2662: disable webextension restrictions on certain mozilla domains (also see 4503) [FF60+]
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/* 2662: disable webextension restrictions on certain mozilla domains (you also need 4503) [FF60+]
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* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1384330,1406795,1415644,1453988 ***/
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// user_pref("extensions.webextensions.restrictedDomains", "");
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@ -1397,12 +1412,13 @@ user_pref("privacy.firstparty.isolate", true);
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This spoof *shouldn't* affect core chrome/Firefox performance
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** 1217238 - reduce precision of time exposed by javascript (FF55+)
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** 1369303 - spoof/disable performance API (see 2410-deprecated, 4602, 4603) (FF56+)
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** 1333651 & 1383495 & 1396468 - spoof Navigator API (see section 4700) (FF56+)
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FF56: The version number will be rounded down to the nearest multiple of 10
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FF57: The version number will match current ESR (1393283, 1418672, 1418162, 1511763)
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FF59: The OS will be reported as Windows, OSX, Android, or Linux (to reduce breakage) (1404608)
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FF66: The OS in HTTP Headers will be reduced to Windows or Android (1509829)
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FF68: Reported OS versions updated to Windows 10, OS 10.14, and Adnroid 8.1 (1511434)
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** 1333651 & 1383495 & 1396468 - spoof User Agent & Navigator API (see section 4700) (FF56+)
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FF56: Version: rounded down to the nearest multiple of 10
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FF57: Version: match current ESR (1393283, 1418672, 1418162, 1511763)
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FF59: OS: Windows, OSX, Android, or Linux (to reduce breakage) (1404608)
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FF66: OS: HTTP Headers reduced to Windows or Android (1509829)
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FF68: OS: updated to Windows 10, OS 10.14, and Android 8.1 (1511434)
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FF78: OS: updated to OS 10.15 and Android 9.0 (1635011)
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** 1369319 - disable device sensor API (see 4604) (FF56+)
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** 1369357 - disable site specific zoom (see 4605) (FF56+)
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** 1337161 - hide gamepads from content (see 4606) (FF56+)
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@ -1416,7 +1432,7 @@ user_pref("privacy.firstparty.isolate", true);
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** 1354633 - limit MediaError.message to a whitelist (FF57+)
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** 1382533 - enable fingerprinting resistance for Presentation API (FF57+)
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This blocks exposure of local IP Addresses via mDNS (Multicast DNS)
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** 967895 - enable site permission prompt before allowing canvas data extraction (FF58+)
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** 967895 - spoof canvas and enable site permission prompt before allowing canvas data extraction (FF58+)
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FF59: Added to site permissions panel (1413780) Only prompt when triggered by user input (1376865)
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** 1372073 - spoof/block fingerprinting in MediaDevices API (FF59+)
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Spoof: enumerate devices reports one "Internal Camera" and one "Internal Microphone" if
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@ -1439,6 +1455,7 @@ user_pref("privacy.firstparty.isolate", true);
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** 1564422 - spoof audioContext outputLatency (FF70+)
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** 1595823 - spoof audioContext sampleRate (FF72+)
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** 1607316 - spoof pointer as coarse and hover as none (ANDROID) (FF74+)
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** 1621433 - randomize canvas (previously FF58+ returned an all-white canvas) (FF78+)
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***/
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user_pref("_user.js.parrot", "4500 syntax error: the parrot's popped 'is clogs");
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/* 4501: enable privacy.resistFingerprinting [FF41+]
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@ -1690,6 +1707,27 @@ user_pref("toolkit.telemetry.hybridContent.enabled", false); // [FF59+]
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// [-] https://bugzilla.mozilla.org/1488583
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user_pref("dom.indexedDB.enabled", true); // [DEFAULT: true]
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// * * * /
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// FF74
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// 0203: use Mozilla geolocation service instead of Google when geolocation is enabled
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// Optionally enable logging to the console (defaults to false)
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// [-] https://bugzilla.mozilla.org/1613627
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user_pref("geo.wifi.uri", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
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// user_pref("geo.wifi.logging.enabled", true); // [HIDDEN PREF]
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// 1704: set behaviour on "+ Tab" button to display container menu [FF53+] [SETUP-CHROME]
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// 0=no menu (default), 1=show when clicked, 2=show on long press
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// [1] https://bugzilla.mozilla.org/1328756
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// [-] https://bugzilla.mozilla.org/1606265
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user_pref("privacy.userContext.longPressBehavior", 2);
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// 2012: limit WebGL
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// [-] https://bugzilla.mozilla.org/1477756
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user_pref("webgl.disable-extensions", true);
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// * * * /
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// FF76
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// 0401: sanitize blocklist url
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// [2] https://trac.torproject.org/projects/tor/ticket/16931
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// [-] https://bugzilla.mozilla.org/1618188
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user_pref("extensions.blocklist.url", "https://blocklists.settings.services.mozilla.com/v1/blocklist/3/%APP_ID%/%APP_VERSION%/");
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// * * * /
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// ***/
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/* END: internal custom pref to test for syntax errors ***/
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