Update 'user.js'

This commit is contained in:
Narsil 2021-08-18 10:27:50 +00:00
parent 3921876b05
commit a10f2d466f
1 changed files with 58 additions and 66 deletions

124
user.js
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@ -354,8 +354,8 @@ user_pref("privacy.socialtracking.block_cookies.enabled", false);
// SAFE BROWSING (SB)
// >>>>>>>>>>>>>>>>>>>>>
// Disable SB (Safe Browsing)
// [WARNING] Do this at your own risk! These are the master switches.
// [SETTING] Privacy & Security>Security>... "Block dangerous and deceptive content" ***/
// [WARNING] Do this at your own risk! These are the master switches
// [SETTING] Privacy & Security>Security>... Block dangerous and deceptive content
user_pref("browser.safebrowsing.malware.enabled", false);
user_pref("browser.safebrowsing.phishing.enabled", false);
user_pref("browser.safebrowsing.passwords.enabled", false);
@ -375,7 +375,7 @@ user_pref("browser.safebrowsing.downloads.remote.url", "");
user_pref("browser.safebrowsing.downloads.remote.block_potentially_unwanted", false);
user_pref("browser.safebrowsing.downloads.remote.block_uncommon", false);
// -------------------------------------
// Disable 'ignore this warning' on SB warnings [FF45+]
// Disable ''ignore this warning'' on SB warnings [FF45+]
// If clicked, it bypasses the block for that session. This is a means for admins to enforce SB
// https://bugzilla.mozilla.org/1226490 ***/
user_pref("browser.safebrowsing.allowOverride", false);
@ -421,7 +421,7 @@ user_pref("extensions.systemAddon.update.enabled", false); // [FF62+]
user_pref("extensions.systemAddon.update.url", ""); // [FF44+]
// -------------------------------------
// Disable PingCentre telemetry (used in several System Add-ons) [FF57+]
// Currently blocked by 'datareporting.healthreport.uploadEnabled' ***/
// Currently blocked by ''datareporting.healthreport.uploadEnabled''
user_pref("browser.ping-centre.telemetry", false);
// -------------------------------------
// Disable Screenshots
@ -473,12 +473,12 @@ user_pref("network.http.speculative-parallel-limit", 0);
// HTTP* / TCP/IP / DNS / PROXY / SOCKS etc ***/
// >>>>>>>>>>>>>>>>>>>>>
// Disable IPv6
// IPv6 can be abused, especially with MAC addresses, and can leak with VPNs. That's even
// assuming your ISP and/or router and/or website can handle it. Sites will fall back to IPv4
// IPv6 can be abused, especially with MAC addresses, and can leak with VPNs: assuming
// your ISP and/or router and/or website is IPv6 capable. Most sites will fall back to IPv4
// [STATS] Firefox telemetry (July 2021) shows ~10% of all connections are IPv6
// [NOTE] This is just an application level fallback. Disabling IPv6 is best done at an
// [NOTE] This is an application level fallback. Disabling IPv6 is best done at an
// OS/network level, and/or configured properly in VPN setups. If you are not masking your IP,
// then this won't make much difference. If you are masking your IP, then it can only help.
// then this won't make much difference. If you are masking your IP, then it can only help
// [NOTE] PHP defaults to IPv6 with "localhost". Use "php -S 127.0.0.1:PORT"
// [TEST] https://ipleak.org/
// https://www.internetsociety.org/tag/ipv6-security/
@ -486,7 +486,7 @@ user_pref("network.dns.disableIPv6", true);
// -------------------------------------
// Disable HTTP2
// HTTP2 raises concerns with "multiplexing" and "server push", does nothing to
// enhance privacy, and opens up a number of server-side fingerprinting opportunities.
// enhance privacy, and opens up a number of server-side fingerprinting opportunities
// [WARNING] Don't disable HTTP2. Don't be that one person using HTTP1.1 on HTTP2 sites
// [STATS] ~46% of sites (July 2021)
// https://http2.github.io/faq/
@ -500,7 +500,7 @@ user_pref("network.dns.disableIPv6", true);
// user_pref("network.http.spdy.websockets", false); // [FF65+]
// -------------------------------------
// Disable HTTP Alternative Services [FF37+]
// [SETUP-PERF] Relax this if you have FPI enabled *AND* you understand the
// [SETUP-PERF] Relax this if you have FPI enabled and you understand the
// consequences. FPI isolates these, but it was designed with the Tor protocol in mind,
// and the Tor Browser has extra protection, including enhanced sanitizing per Identity.
// https://tools.ietf.org/html/rfc7838#section-9
@ -543,10 +543,10 @@ user_pref("network.trr.confirmationNS", "");
// LOCATION BAR / SEARCH BAR / SUGGESTIONS / HISTORY / FORMS
// >>>>>>>>>>>>>>>>>>>>>
// Disable location bar using search
// Don't leak URL typos to a search engine, give an error message instead.
// Don't leak URL typos to a search engine, give an error message instead
// Examples: "secretplace,com", "secretplace/com", "secretplace com", "secret place.com"
// [NOTE] This does **not** affect explicit user action such as using search buttons in the
// dropdown, or using keyword search shortcuts you configure in options (e.g. 'd' for DuckDuckGo)
// [NOTE] This does not affect explicit user action such as using search buttons in the
// dropdown, or using keyword search shortcuts you configure in options (e.g. ''d'' for DuckDuckGo)
// [SETUP-CHROME] If you don't, or rarely, type URLs, or you use a default search
// engine that respects privacy, then you probably don't need this ***/
// user_pref("keyword.enabled", false);
@ -642,7 +642,7 @@ user_pref("signon.management.page.breach-alerts.enabled", false);
user_pref("signon.management.page.breachAlertUrl", "");
// -------------------------------------
// Use a primary password
// There are no preferences for this. It is all handled internally.
// There are no preferences for this. It is all handled internally
// [SETTING] Privacy & Security>Logins and Passwords>Use a Primary Password
// https://support.mozilla.org/kb/use-primary-password-protect-stored-logins-and-pas ***/
// Set how often Firefox should ask for the primary password
@ -725,12 +725,10 @@ user_pref("browser.sessionstore.privacy_level", 2);
// -------------------------------------
// Set the minimum interval between session save operations
// Increasing this can help on older machines and some websites, as well as reducing writes
// Default is 15000 (15 secs). Try 30000 (30 secs), 60000 (1 min) etc
// [SETUP-CHROME] This can also affect entries in the "Recently Closed Tabs" feature:
// i.e. the longer the interval the more chance a quick tab open/close won't be captured.
// This longer interval *may* affect history but we cannot replicate any history not recorded
// [SETUP-CHROME] This can affect entries in "Recently Closed Tabs": i.e. the
// longer the interval the more chance a quick tab open/close won't be captured
// https://bugzilla.mozilla.org/1304389 ***/
user_pref("browser.sessionstore.interval", 30000);
user_pref("browser.sessionstore.interval", 30000); // [DEFAULT: 15000]
// -------------------------------------
// Disable automatic Firefox start and session restore after reboot [FF62+] [WINDOWS]
// https://bugzilla.mozilla.org/603903 ***/
@ -741,7 +739,7 @@ user_pref("toolkit.winRegisterApplicationRestart", false);
// >>>>>>>>>>>>>>>>>>>>>
// Disable favicons in shortcuts
// URL shortcuts use a cached randomly named .ico file which is stored in your
// profile/shortcutCache directory. The .ico remains after the shortcut is deleted.
// profile/shortcutCache directory. The .ico remains after the shortcut is deleted
// If set to false then the shortcuts use a generic Firefox icon ***/
user_pref("browser.shell.shortcutFavicons", false);
// -------------------------------------
@ -763,7 +761,7 @@ user_pref("alerts.showFavicons", false); // [DEFAULT: false]
// as they're potentially vulnerable to a MiTM attack [3]. 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.
// 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 ***/
@ -771,7 +769,7 @@ user_pref("security.ssl.require_safe_negotiation", true);
// -------------------------------------
// Control TLS versions with min and max
// 1=TLS 1.0, 2=TLS 1.1, 3=TLS 1.2, 4=TLS 1.3
// [WARNING] Leave these at default, otherwise you alter your TLS fingerprint.
// [WARNING] Leave these at default, otherwise you alter your TLS fingerprint
// https://www.ssllabs.com/ssl-pulse/ ***/
// user_pref("security.tls.version.min", 3); // [DEFAULT: 3]
// user_pref("security.tls.version.max", 4);
@ -828,9 +826,9 @@ user_pref("security.OCSP.require", false);
// 2=deprecated option that now maps to 1
// 3=only allowed for locally-added roots (e.g. anti-virus)
// 4=only allowed for locally-added roots or for certs in 2015 and earlier
// [SETUP-CHROME] When disabled, some man-in-the-middle devices (e.g. security scanners and
// antivirus products, may fail to connect to HTTPS sites. SHA-1 is *almost* obsolete.
// [1] https://blog.mozilla.org/security/2016/10/18/phasing-out-sha-1-on-the-public-web/ ***/
// [SETUP-CHROME] When disabled, some man-in-the-middle devices, e.g. security scanners and
// antivirus products, may fail to connect to HTTPS sites. SHA-1 is *almost* obsolete
// https://blog.mozilla.org/security/2016/10/18/phasing-out-sha-1-on-the-public-web/ ***/
user_pref("security.pki.sha1_enforcement_level", 1);
// -------------------------------------
// Disable Windows 8.1's Microsoft Family Safety cert [FF50+] [WINDOWS]
@ -891,8 +889,8 @@ user_pref("dom.security.https_only_mode_pbm", true); // [FF80+]
// user_pref("dom.security.https_only_mode.upgrade_local", true);
// -------------------------------------
// Disable HTTP background requests [FF82+]
// When attempting to upgrade, if the server doesn't respond within 3 seconds, firefox
// sends HTTP requests in order to check if the server supports HTTPS or not.
// When attempting to upgrade, if the server doesn't respond within 3 seconds,
// Firefox sends HTTP requests in order to check if the server supports HTTPS or not
// This is done to avoid waiting for a timeout which takes 90 seconds
// https://bugzilla.mozilla.org/buglist.cgi?bug_id=1642387,1660945 ***/
user_pref("dom.security.https_only_mode_send_http_background_request", false);
@ -934,7 +932,7 @@ user_pref("security.ssl.treat_unsafe_negotiation_as_broken", true);
// -------------------------------------
// Control "Add Security Exception" dialog on SSL warnings
// 0=do neither 1=pre-populate url 2=pre-populate url + pre-fetch cert (default)
// [1] https://github.com/pyllyukko/user.js/issues/210 ***/
// https://github.com/pyllyukko/user.js/issues/210 ***/
user_pref("browser.ssl_override_behavior", 1);
// -------------------------------------
// Display advanced information on Insecure Connection warning pages
@ -1048,8 +1046,8 @@ user_pref("privacy.userContext.enabled", true);
user_pref("media.gmp-provider.enabled", false);
// -------------------------------------
// Disable downloading OpenH264 codec at the first start of Firefox
user_pref("media.gmp-gmpopenh264.enabled", false);
// -------------------------------------
user_pref("media.gmp-gmpopenh264.enabled", false);
// -------------------------------------
// Disable widevine CDM (Content Decryption Module)
// [SETUP-WEB] e.g. Netflix, Amazon Prime, Hulu, HBO, Disney+, Showtime, Starz, DirectTV
user_pref("media.gmp-widevinecdm.enabled", false);
@ -1116,8 +1114,8 @@ user_pref("media.autoplay.blocking_policy", 2);
user_pref("dom.disable_window_move_resize", true);
// -------------------------------------
// Open links targeting new windows in a new tab instead
// This stops malicious window sizes and some screen resolution leaks.
// You can still right-click a link and open in a new window.
// This stops malicious window sizes and some screen resolution leaks
// You can still right-click a link and open in a new window
// [TEST] https://arkenfox.github.io/TZP/tzp.html#screen
// https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/9881 ***/
user_pref("browser.link.open_newwindow", 3); // 1=most recent window or tab 2=new window, 3=new tab
@ -1134,7 +1132,6 @@ user_pref("browser.link.open_newwindow.restriction", 0);
user_pref("dom.disable_open_during_load", true);
// -------------------------------------
// Limit events that can cause a popup [SETUP-WEB]
// default FF86+: "change click dblclick auxclick mousedown mouseup pointerdown pointerup notificationclick reset submit touchend contextmenu" ***/
user_pref("dom.popup_allowed_events", "click dblclick mousedown pointerdown");
//
// >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
@ -1145,10 +1142,10 @@ user_pref("dom.popup_allowed_events", "click dblclick mousedown pointerdown");
// browser and network, are event driven, and can control the web page/site it is associated
// with, intercepting and modifying navigation and resource requests, and caching resources.
// [NOTE] Service worker APIs are hidden (in Firefox) and cannot be used when in PB mode.
// [NOTE] Service workers only run over HTTPS. Service workers have no DOM access.
// [SETUP-WEB] Disabling service workers will break some sites. This pref is required true for
// service worker notifications, push notifications and service worker
// cache. If you enable this pref, then check those settings as well ***/
// https://bugzilla.mozilla.org/show_bug.cgi?id=1320796#c7 ***/
user_pref("dom.serviceWorkers.enabled", false);
// -------------------------------------
// Disable Web Notifications
@ -1159,11 +1156,10 @@ user_pref("dom.webnotifications.enabled", false); // [FF22+]
// -------------------------------------
// Disable Push Notifications [FF44+]
// Push is an API that allows websites to send you (subscribed) messages even when the site
// isn't loaded, by pushing messages to your userAgentID through Mozilla's Push Server.
// isn't loaded, by pushing messages to your userAgentID through Mozilla's Push Server
// [NOTE] Push requires service workers to subscribe to and display, and is behind
// a prompt. Disabling service workers alone doesn't stop Firefox polling the
// Mozilla Push Server. To remove all subscriptions, reset your userAgentID (in about:config
// or on start), and you will get a new one within a few seconds.
// Mozilla Push Server. To remove all subscriptions, reset your userAgentID
// https://support.mozilla.org/kb/push-notifications-firefox
// https://developer.mozilla.org/docs/Web/API/Push_API ***/
user_pref("dom.push.enabled", false);
@ -1188,8 +1184,8 @@ user_pref("dom.push.userAgentID", "");
// Disable website access to clipboard events/content [SETUP-HARDEN]
// [NOTE] This will break some sites' functionality e.g. Outlook, Twitter, Facebook, Wordpress
// This applies to onCut/onCopy/onPaste events - i.e. it requires interaction with the website
// [WARNING] In FF88 or lower, with clipboardevents enabled, if both 'middlemouse.paste' and
// 'general.autoScroll' are true (at least one is default false) then the clipboard can leak
// [WARNING] In FF88 or lower, with clipboardevents enabled, if both ''middlemouse.paste'' and
// ''general.autoScroll'' are true (at least one is default false) then the clipboard can leak
// https://bugzilla.mozilla.org/1528289
user_pref("dom.event.clipboardevents.enabled", false);
// -------------------------------------
@ -1201,7 +1197,6 @@ user_pref("dom.allow_cut_copy", false);
// Disable "Confirm you want to leave" dialog on page close
// Does not prevent JS leaks of the page close event.
// https://developer.mozilla.org/docs/Web/Events/beforeunload
// https://support.mozilla.org/questions/1043508 ***/
user_pref("dom.disable_beforeunload", true);
// -------------------------------------
// Disable shaking the screen ***/
@ -1331,7 +1326,7 @@ user_pref("devtools.selfxss.count", 0);
user_pref("mathml.disabled", true);
// -------------------------------------
// Disable in-content SVG (Scalable Vector Graphics) [FF53+]
// [WARNING] Expect breakage incl. youtube player controls. Best left for a "hardened" profile.
// [WARNING] Expect breakage including youtube player controls
// https://bugzilla.mozilla.org/1216893 ***/
// user_pref("svg.disabled", true);
// -------------------------------------
@ -1364,12 +1359,12 @@ user_pref("network.IDN_show_punycode", true);
// Enforce PDFJS, disable PDFJS scripting [SETUP-CHROME]
// This setting controls if the option "Display in Firefox" is available in the setting below
// and by effect controls whether PDFs are handled in-browser or externally ("Ask" or "Open With")
// PROS: pdfjs is lightweight, open source, and as secure/vetted as any pdf reader out there (more than most)
// PROS: pdfjs is lightweight, open source, and as secure/vetted more than most
// Exploits are rare (one serious case in seven years), treated seriously and patched quickly.
// It doesn't break "state separation" of browser content (by not sharing with OS, independent apps).
// It maintains disk avoidance and application data isolation. It's convenient. You can still save to disk.
// CONS: You may prefer a different pdf reader for security reasons
// CAVEAT: JS can still force a pdf to open in-browser by bundling its own code (rare)
// CAVEAT: JS can still force a pdf to open in-browser by bundling its own code
// [SETTING] General>Applications>Portable Document Format (PDF) ***/
user_pref("pdfjs.disabled", false); // [DEFAULT: false]
user_pref("pdfjs.enableScripting", false); // [FF86+]
@ -1404,7 +1399,6 @@ user_pref("extensions.postDownloadThirdPartyPrompt", false);
// * https://bugzilla.mozilla.org/1381938
// * https://bugzilla.mozilla.org/1411425 ***/
user_pref("widget.non-native-theme.enabled", true); // [DEFAULT: true FF89+]
//
//
// >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
// DOWNLOADS ***/
@ -1491,8 +1485,7 @@ user_pref("network.cookie.thirdparty.nonsecureSessionOnly", true); // [FF58+]
user_pref("network.cookie.lifetimePolicy", 2);
// -------------------------------------
// Disable DOM (Document Object Model) Storage
// [WARNING] This will break a LOT of sites' functionality AND extensions!
// You are better off using an extension for more granular control ***/
// [WARNING] This will break a LOT of sites and extensions!
// user_pref("dom.storage.enabled", false);
// -------------------------------------
// Disable offline cache (appCache)
@ -1529,11 +1522,10 @@ user_pref("dom.storage.next_gen", true);
user_pref("privacy.sanitize.sanitizeOnShutdown", true);
// -------------------------------------
// Set what items to clear on shutdown [SETUP-CHROME]
// [NOTE] If 'history' is true, downloads will also be cleared regardless of the value
// but if 'history' is false, downloads can still be cleared independently
// However, this may not always be the case. The interface combines and syncs these
// prefs when set from there, and the sanitize code may change at any time
// [NOTE] If "history" is true, downloads will also be cleared
// [NOTE] Active Logins does not refer to logins via cookies, but rather HTTP Basic Authentication
// [SETTING] Privacy & Security>History>Custom Settings>Clear history when Firefox closes>Settings ***/
// https://en.wikipedia.org/wiki/Basic_access_authentication
user_pref("privacy.clearOnShutdown.cache", true);
user_pref("privacy.clearOnShutdown.cookies", true);
user_pref("privacy.clearOnShutdown.downloads", true); // see note above
@ -1545,9 +1537,9 @@ user_pref("privacy.clearOnShutdown.siteSettings", false); // Site Preferences
// -------------------------------------
// Reset default items to clear with Ctrl-Shift-Del [SETUP-CHROME]
// This dialog can also be accessed from the menu History>Clear Recent History
// Firefox remembers your last choices. This will reset them when you start Firefox.
// [NOTE] Regardless of what you set privacy.cpd.downloads to, as soon as the dialog
// for "Clear Recent History" is opened, it is synced to the same as 'history' ***/
// Firefox remembers your last choices. This will reset them when you start Firefox
// [NOTE] Regardless of what you set "downloads" to, as soon as the dialog
// for "Clear Recent History" is opened, it is synced to the same as "history"
user_pref("privacy.cpd.cache", true);
user_pref("privacy.cpd.cookies", true);
// user_pref("privacy.cpd.downloads", true); // not used, see note above
@ -1565,12 +1557,11 @@ user_pref("privacy.cpd.siteSettings", false); // Site Preferences
// user_pref("privacy.clearOnShutdown.openWindows", true);
// user_pref("privacy.cpd.openWindows", true);
// -------------------------------------
// Reset default 'Time range to clear' for 'Clear Recent History'
// Firefox remembers your last choice. This will reset the value when you start Firefox.
// 0=everything, 1=last hour, 2=last two hours, 3=last four hours,
// 4=today, 5=last five minutes, 6=last twenty-four hours
// [NOTE] The values 5 + 6 are not listed in the dropdown, which will display a
// blank value if they are used, but they do work as advertised ***/
// Reset default "Time range to clear" for "Clear Recent History"
// Firefox remembers your last choice. This will reset the value when you start Firefox
// 0=everything, 1=last hour, 2=last two hours, 3=last four hours, 4=today
// [NOTE] Values 5 (last 5 minutes) and 6 (last 24 hours) are not listed in the dropdown,
// which will display a blank value, and are not guaranteed to work ***/
user_pref("privacy.sanitize.timeSpan", 0);
//
// >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
@ -1585,7 +1576,7 @@ user_pref("privacy.firstparty.isolate", true);
// [NOTE] Setting this to false may reduce the breakage
// FF65+ blocks postMessage with targetOrigin "*" if originAttributes don't match. But
// to reduce breakage it ignores the 1st-party domain (FPD) originAttribute
// The 2nd pref removes that limitation and will only allow communication if FPDs also match.
// The 2nd pref removes that limitation and will only allow communication if FPDs also match
// https://bugzilla.mozilla.org/1319773#c22
// https://bugzilla.mozilla.org/1492607
// https://developer.mozilla.org/docs/Web/API/Window/postMessage ***/
@ -1605,14 +1596,13 @@ user_pref("privacy.partition.network_state", true);
// RFP (RESIST FINGERPRINTING)
// >>>>>>>>>>>>>>>>>>>>>
// Enable privacy.resistFingerprinting [FF41+]
// [SETUP-WEB] RFP can cause the odd website to break in strange ways, and has a few side affects,
// but is largely robust nowadays. Give it a try. Your choice.
// https://bugzilla.mozilla.org/418986 ***/
// [SETUP-WEB] RFP can some cause website breakage: mainly canvas, use a site exception via the urlbar
// RFP also has a few side effects: mainly timezone is UTC0, and websites will prefer light theme
user_pref("privacy.resistFingerprinting", true);
// -------------------------------------
// Set new window sizes to round to hundreds [FF55+] [SETUP-CHROME]
// Width will round down to multiples of 200s and height to 100s, to fit your screen.
// The override values are a starting point to round from if you want some control
// The max values are a starting point to round from if you want some control
// https://bugzilla.mozilla.org/1330882 ***/
// user_pref("privacy.window.maxInnerWidth", 1000);
// user_pref("privacy.window.maxInnerHeight", 1000);
@ -1627,8 +1617,10 @@ user_pref("extensions.webextensions.identity.redirectDomain", "");
// -------------------------------------
// Enable RFP letterboxing [FF67+]
// Dynamically resizes the inner window by applying margins in stepped ranges
// If you use the dimension pref, then it will only apply those resolutions. The format is
// "width1xheight1, width2xheight2, ..." (e.g. "800x600, 1000x1000, 1600x900")
// If you use the dimension pref, then it will only apply those resolutions.
// The format is "width1xheight1, width2xheight2, ..." (e.g. "800x600, 1000x1000")
// [SETUP-WEB] This is independent of RFP. If you're not using RFP, or you are but
// dislike the margins, then flip this pref, keeping in mind that it is effectively fingerprintable
// [WARNING] DO NOT USE: the dimension pref is only meant for testing
// https://bugzilla.mozilla.org/1407366
// https://hg.mozilla.org/mozilla-central/rev/6d2d7856e468#l2.32 ***/