All PlatformsDoingOnion ServicesProject 131Q1
Enable network.http.referer.hideOnionSource in base-browserbug 41627: Enable network.http.referer.hideOnionSource in base-browser

(cherry picked from commit 90df17dac724c43bbc533a0f449a72ba419d9d67)

Document why we are locking toolkit.telemetry.enabled.

(cherry picked from commit 933d8c65af7f04677f7bc0ec672088f66ed0a9c9)

Disable toolkit.telemetry.enabled on all builds, set webextensions.storage.sync.enabled to false

(cherry picked from commit ad5720b019191e0911e11e7ea26ff32a0de132de)

BackportNextQ1Windows
Disable and lock Windows SSOBug 41578: Disable and lock Windows SSO

(cherry picked from commit 18dfe4652e9de6b9021802530f899d18a393df12)

This hack directly includes our preference changes in omni.ja.

Apps::Impact::NoneApps::Type::BugBugDesktopRoadmap::FutureUpdaterWindows
staged updates fail on WindowsBug 18292: Staged updates fail on Windows

Temporarily disable staged updates on Windows.

BugFingerprinting
Tor browser uses Chinese-style glyphs to display JapaneseBug 18297: Use separate Noto JP,KR,SC,TC fonts

BugFingerprinting
Noto Sans Buginese missing from macOS font whitelistBug 23404: Add Noto Sans Buginese to the macOS whitelist

Bug
Tab crashes when using Tor Browser to access Google DriveBug 23745: Set dom.indexedDB.enabled = true

BugFingerprintingFirst Contribution
Disable randomised Firefox HTTP cache decay user test groupsBug 13575: Disable randomised Firefox HTTP cache decay user tests. (Fernando Fernandez Mancera <ffmancera@riseup.net>)

FeatureLinkabilityPerformance
Confirm TLS session resumption/ID are isolated to the URL bar domain, and re-enable themBug 17252: Enable session identifiers with FPI

Session tickets and session identifiers were isolated by OriginAttributes, so we can re-enable them by allowing the default value (true) of "security.ssl.disable_session_identifiers".

The pref "security.enable_tls_session_tickets" is obsolete (removed in https://bugzilla.mozilla.org/917049)

LinkabilityPerformanceTaskUX
Audit HTTP/2 and SPDY if neededBug 14952: Enable http/2 and AltSvc

In Firefox, SPDY/HTTP2 now uses Origin Attributes for isolation of connections, push streams, origin frames, etc. That means we get first-party isolation provided "privacy.firstparty.isolate" is true. So in this patch, we stop overriding "network.http.spdy.enabled" and "network.http.spdy.enabled.http2".

Alternate Services also use Origin Attributes for isolation. So we stop overriding "network.http.altsvc.enabled" and "network.http.altsvc.oe" as well.

(All 4 of the abovementioned "network.http.*" prefs adopt Firefox 60ESR's default value of true.)

However, we want to disable HTTP/2 push for now, so we set "network.http.spdy.allow-push" to false.

"network.http.spdy.enabled.http2draft" was removed in RESOLVED FIXED(Fx41), [spdy]
remove h2-draft support starting in gecko-40Bug 1132357. "network.http.sped.enabled.v2" was removed in VERIFIED FIXED(Fx27)
remove spdy/2 supportBug 912550. "network.http.sped.enabled.v3" was removed in RESOLVED FIXED(Fx36), spdy
kill spdy/3Bug 1097944. "network.http.sped.enabled.v3-1" was removed in RESOLVED FIXED(Fx51), Blocks: 912549, [necko-active]
remove spdy/3.1 supportBug 1248197.

FingerprintingTask
Adapt to upstreamed AddonManager changesBug 26114: addons.mozilla.org is not special

• Don't expose navigator.mozAddonManager on any site
• Don't block NoScript from modifying addons.mozilla.org or other sites

Enable ReaderView mode again (#27281).

BugProxy Bypass
Group Policies for Firefox can bypass Tor Browser's proxy settingsBug 29916: Make sure enterprise policies are disabled

MikePerry201408RMikePerryIterationFires20110529actualpoints::1backport-to-mozillacomponent::firefox patch issuesowner::mikeperrypoints::4priority::mediumresolution::fixedseverity::blockerstatus::closedtbb-no-uplift-60type::enhancement
Block access to Components.interfaces from content scriptBug 2874: Block Components.interfaces from content

BugBugSmashFundFingerprinting
Setting general.useragent.override does not spoof the platform part anymore in ESR 60 which is confusingBug 26146: Spoof HTTP User-Agent header for desktop platforms

In Tor Browser 8.0, the OS was revealed in both the HTTP User-Agent header and to JavaScript code via navigator.userAgent. To avoid leaking the OS inside each HTTP request (which many web servers log), always use the Windows 7 OS value in the desktop User-Agent header. We continue to allow access to the actual OS via JavaScript, since doing so improves compatibility with web applications such as GitHub and Google Docs.

BugUX
Windows Jump Lists fail for Tor BrowserBug 12885: Windows Jump Lists fail for Tor Browser

Jumplist entries are stored in a binary file in: %APPDATA%\Microsoft\Windows\Recent\CustomDestinations
and has a name in the form [a-f0-9]+.customDestinations-ms

The hex at the front is unique per app, and is ultimately derived from something called the 'App User Model ID' (AUMID) via some unknown hashing method. The AUMID is provided as a key when programmatically creating, updating, and deleting a jumplist. The default behaviour in firefox is for the installer to define an AUMID for an app, and save it in the registry so that the jumplist data can be removed by the uninstaller.

However, the Tor Browser does not set this (or any other) regkey during installation, so this codepath fails and the app's AUMID is left undefined. As a result the app's AUMID ends up being defined by windows, but unknowable by Tor Browser. This unknown AUMID is used to create and modify the jumplist, but the delete API requires that we provide the app's AUMID explicitly. Since we don't know what the AUMID is (since the expected regkey where it is normally stored does not exist) jumplist deletion will fail and we will leave behind a mostly empty customDestinations-ms file. The name of the file is derived from the binary path, so an enterprising person could reverse engineer how that hex name is calculated, and generate the name for Tor Browser's default Desktop installation path to determine whether a person had used Tor Browser in the past.

The 'taskbar.grouping.useprofile' option that is enabled by this patch works around this AUMID problem by having firefox.exe create it's own AUMID based on the profile path (rather than looking for a regkey). This way, if a user goes in and enables and disables jumplist entries, the backing store is properly deleted.

Unfortunately, all windows users currently have this file lurking in the above mentioned directory and this patch will not remove it since it was created with an unknown AUMID. However, another patch could be written which goes to that directory and deletes any item containing the 'Tor Browser' string. See Apps::Impact::MinimalApps::Type::BugBugDisk LeakRoadmap::FutureWindows
Tor Browser on Windows creates a file in %APPDATA%\Microsoft\Windows\Recent\CustomDestinations containing the Tor Browser install locationbug 28996.

Bug
Make sure default Firefox themes are enabled on ESR68Bug 30845: Make sure default themes and other internal extensions are enabled

Task
Make sure our bundled WebExtensions are running in Private Browsing ModeBug 28896: Enable extensions in private browsing by default

BugBugSmashFund
Set network.proxy.allow_hijacking_localhost to trueBug 31065: Explicitly allow proxying localhost

Bug
Properly enable letterboxing (again)Bug 31598: Enable letterboxing

Disable Presentation API everywhere

BugSmashFundTask
Investigate wasm for linkability/fingerprintability/disk avoidance issuesBug 21549 - Use Firefox's WASM default pref. It is disabled at safer security levels.

BugLinkability
https://mitmdetection.services.mozilla.com/ is contacted over catch-all circuitBug 32321: Disable Mozilla's MitM pings

Bug
Tor Browser warning: "Your Firefox is out of date."Bug 19890: Disable installation of system addons

By setting the URL to "" we make sure that already installed system addons get deleted as well.

BugFingerprinting
Firefox downgrades VP9 videos to VP8 when measured performance is not enoughBug 22548: Firefox downgrades VP9 videos to VP8.

On systems where H.264 is not available or no HWA, VP9 is preferred. But in Tor Browser 7.0 all youtube videos are degraded to VP8.

This behaviour can be turned off by setting media.benchmark.vp9.threshold to 0. All clients will get better experience and lower traffic, beause TBB doesn't use "Use hardware acceleration when available".

AndroidBugBugSmashFund
Create tor-browser for mobile branch based on mozilla-centralBug 25741 - TBA: Add mobile-override of 000-tor-browser prefs

BugBugSmashFundSecurityUX
8-month-old Tor Browser offers to "Reset Tor Browser", removes extensionsBug 16441: Suppress "Reset Tor Browser" prompt.

BugDisk LeakUX
Default value of media.cache_size (0) causes some media to load extremely slowly or become unplayableBug 29120: Use the in-memory media cache and increase its maximum size.

BugNext
Investigate new Search Engine configurationBug 33697: use old search config based on list.json

Bug
Don't use site's icon as window icon in Windows when in private browsing modeBug 33855: Ensure that site-specific browser mode is disabled.

Feature
Adapt Intermediate Preloading for Tor BrowserBug 30682: Disable Intermediate CA Preloading.

Fingerprinting
ensure that Windows default browser agent is omittedBug 40061: Omit the Windows default browser agent from the build

Backport
Consider disabling network.connectivity-service.enabledBug 40322: Consider disabling network.connectivity-service.enabled

Set svg.context-properties.content.allowed-domains as emptyBug 40408: Disallow SVG Context Paint in all web content

Doing
Set privacy.partition.network_state = false until we evaluate dFPIBug 40308: Disable network partitioning until we evaluate dFPI

Backport
Consider disabling network.connectivity-service.enabledBug 40322: Consider disabling network.connectivity-service.enabled

Disable dom.enable_event_timingBug 40383: Disable dom.enable_event_timing

Flip network.http.http3.enabledBug 40423: Disable http/3

Doing
Clean up obsolete preferences in our 000-tor-browser.jsBug 40177: Update prefs for Fx91esr

User Feedback
Switch Firefox recommendations off by defaultBug 40700: Disable addons and features recommendations

Doing
Set network.proxy.allow_bypass to falseBug 40682: Disable network.proxy.allow_bypass

DoingFingerprintingLinkability
3rd-party cookies are not disabled anymore in Tor Browser 11Bug 40736: Disable third-party cookies in PBM

FeatureFor Network Health TeamNeeds DesignSecurityUX
Disable Plaintext HTTP Clearnet ConnectionsBug 19850: Enabled HTTPS-Only by default

NextQ2UXUser Feedback
Hide screenshots menu since we don't support itBug 40912: Hide the screenshot menu

DoingProject 131Q3UX
moreFromMozilla pane in about:preferences in 12.0a2Bug 41292: Disable moreFromMozilla in preferences page

All PlatformsApps::Impact::HighApps::Type::InvestigationFingerprintingProject 131Roadmap::FutureTask
ensure that CSS4 system colors are not a fingerprinting vectorBug 40057: Ensure the CSS4 system colors are not a fingerprinting vector

DoingFeatureFingerprintingLinkabilityProject 131Q4esr-102
In Tor Browser context, should network.http.tailing.enabled be set to false?Bug 24686: Set network.http.tailing.enabled to true

Project 131Taskesr-102
Consider disabling TLS ciphersuites containing SHA-1Bug 40183: Disable TLS ciphersuites using SHA-1

Project 131Q4Taskesr-102
Review 000-tor-browser.js and 001-base-profile.js for 102Bug 40783: Review 000-tor-browser.js and 001-base-profile.js for 102

We reviewed all the preferences we set for 102, and remove a few old ones. See the description of that issue to see all the preferences we believed were still valid for 102, and some brief description for the reasons to keep them.

Firefox creates a profile as a fallback for old versions. However, we do not need this, so we want to prevent Firefox from creating the related directories.

We comment out the code, but should Mozilla be interested in a compile-time flag, we could rewrite the patch to add one.

See also https://bugzilla.mozilla.org/show_bug.cgi?id=1770174.

MOZ_SOURCE_URL is created by combining MOZ_SOURCE_REPO and MOZ_SOURCE_CHANGESET. But the code takes for granted that it refers to a Hg instance, so it combines them as $MOZ_SOURCE_REPO/rev/$MOZ_SOURCE_CHANGESET. With this commit, we change this logic to combine them to create a URL that is valid for GitLab. $MOZ_SOURCE_CHANGESET needs to be a commit hash, not a branch or a tag. If that is needed, we could use /-/tree/, instead of /-/commit/.

All PlatformsBrowserDoingFeatureProject 131Q1SecurityUX
Prevent NoScript from being removed / disabled until core functionality has been migrated to Tor BrowserBug 41598: Prevent NoScript from being removed/disabled. Backlog
extensions.allowPrivateBrowsingByDefault will be removedBug 40253: Explicitly allow NoScript in Private Browsing mode.

Remove this._monitorIonPref() and this._monitorIonStudies() from BrowserGlue

(cherry picked from commit fc08631d08d49082680b7133571b893242a21dd5)

Firefox Ion (previously Firefox Pioneer) is an opt-in program in which people volunteer to participate in studies that collect detailed, sensitive data about how they use their browser.

Disable activity stream

(cherry picked from commit 9514e0c69e51e308c7706266d07465e016617b5f)

More concretely, SearchService.jsm 'hijack-blocklists' and url-classifier-skip-urls.

Avoid creating instance for 'anti-tracking-url-decoration'.

If prefs are disabling their usage, avoid creating instances for 'cert-revocations' and 'intermediates'.

Do not ship JSON dumps for collections we do not expect to need. For the ones in the 'main' bucket, this prevents them from being synced unnecessarily (the code in remote-settings does so for collections in the main bucket for which a dump or local data exists). For the collections in the other buckets, we just save some size by not shipping their dumps.

We also clear the collections database on the v2 -> v3 migration.

(cherry picked from commit 1bacd26df8a8ffe481e11ec6b8323150fdf2011d)

This component adds a new Security Level toolbar button which visually indicates the current global security level via icon (as defined by the extensions.torbutton.security_slider pref), a drop-down hanger with a short description of the current security level, and a new section in the about:preferences#privacy page where users can change their current security level. In addition, the hanger and the preferences page will show a visual warning when the user has modified prefs associated with the security level and provide a one-click 'Restore Defaults' button to get the user back on recommended settings.

Geckoview: Expose security level interfaceBug 40125: Expose Security Level pref in GeckoView

This is a temporary patch that we need until we switch our strings to Fluent. The reason is that we currently set strings when we populate our XUL content. We could rework the whole mechanism, but it is not worth it because we want to switch to Fluent, which will handle everything automatically.

Change the language selector to be sorted by language code, rather than name, and to display the language code to the user.

LocalizationMacOSProject 131Q4UX
"Japanese" language menu item is localised in multi-locale testbuild (on mac OS)Bug 41372: Handle Japanese as a special case in preferences on macOS

Japanese is treated in a special way on macOS. However, seeing the Japanese language tag could be confusing for users, and moreover the language name is not localized correctly like other langs.

LocalizationNeeds DesignProject 131Q4UX
Inform users when Tor Browser sets their language automaticallyBug 41378: Tell users that they can change their language at the first start

With multi-lingual builds, Tor Browser matches the user's system language, but some users might want to change it. So, we tell them that it is possible, but only once.

Many fonts have issues with their vertical metrics. they are used to influence the height of ascenders and depth of descenders. Gecko uses it to calculate the line height (font height + ascender + descender), however because of that idiosyncratic behavior across multiple operating systems, it can be used to identify the user's OS.

The solution proposed in the patch uses a default factor to be multiplied with the font size, simulating the concept of ascender and descender. This way all operating systems will have the same line height only and only if the frame is outside the chrome.

Unless the -osint command line flag is used, the browser now defaults to the equivalent of -no-remote. There is a new -allow-remote flag that may be used to restore the original (Firefox-like) default behavior.

It looks like these cases should only be invoked in the NSS command line tools, and not the browser, but I decided to patch them anyway because there literally is a maze of network function pointers being passed around, and it's very hard to tell if some random code might not pass in the proper proxied versions of the networking code here by accident.

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1433509

Instead of using the local computer's IP address within symlink-based profile lock signatures, always use 127.0.0.1.

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1769028

This should eliminate our need to rely on a wrapper script that sets /Users/arthur and launches Firefox with -profile.

This checks privacy.spoof_english whenever setLocales is called from Fenix side and sets intl.accept_languages accordingly.

Needs Review
Expose privacy.spoof_english pref in GeckoViewBug 40198: Expose privacy.spoof_english pref in GeckoView

The mechanism to choose the UI font does not play well with our fontconfig configuration. As a result, the final criterion to choose the font for the UI was its version.

Since we hardcode Arimo as a default sans-serif on preferences, we use it also for the UI. FontConfig will fall back to some other font for scripts Arimo does not cover as expected (we tested with Japanese).

In https://bugzilla.mozilla.org/show_bug.cgi?id=1563246 Firefox implemented fetching the Public Suffix List via RemoteSettings and replacing the default one at runtime, which we do not want.

Revert add-on install permissions introduced in Mozilla's 1560059Bug 40025: Remove Mozilla add-on install permissions

Hide elements on about:logins that mention sync, "Firefox LockWise", and Mozilla's LockWise mobile apps.

Disable the "Create New Login" button when security.nocertdb is true.

Only ship the pdfjs extension.

In the past the ClearKey system had not been compiled when specifying --disable-eme. But that changed and it is even bundled nowadays (see: Mozilla's RESOLVED FIXED(Fx52), Blocks: 1299627, 1299694, 1528884
Remove MOZ_EME build option and make EME disabled by preferences.bug 1300654). We don't want to ship it right now as the use case for it is not really visible while the code had security vulnerabilities in the past.

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1768899

The Mozilla bugs: https://bugzilla.mozilla.org/show_bug.cgi?id=1046421, https://bugzilla.mozilla.org/show_bug.cgi?id=1261591, Apps::Impact::MinimalApps::Type::BugBugIceboxUpstreamWindows
iis windows authentication prompt not showing uptor-browser#27602

The browser should not need information related to the network interface or network state, tor should take care of that.

The GeckoView AndroidManifest.xml is not preprocessed unlike Fennec's manifest, so we can't use the ifdef preprocessor guards around the permissions we do not want. Commenting the permissions is the next-best-thing.

DoingQ2
Rebase geckoview patches to 99.0Bug 40857: Modified the fat .aar creation file

This is a workaround to build fat .aars with the compiling enviornment disabled. Mozilla does not use a similar configuration, but either runs a Firefox build and discards its output, or uses artifacts build.

We might switch to artifact builds too, and drop this patch, or write a better one to upstream. But until then we need this patch.

See also https://bugzilla.mozilla.org/show_bug.cgi?id=1763770.

Prevent mach package-multi-locale from actually creating a packageBug 41458: Prevent mach package-multi-locale from actually creating a package

macOS builds need some files to be moved around with ./mach package-multi-locale to create multi-locale packages. The required command isn't exposed through any other mach command. So, we patch package-multi-locale both to prevent it from failing when doing official builds and to detect any future changes on it.

This reverts commit 1eb1364357ac5bc2a4531337fb5416af39c3793f.

This fixes tor-browser#40721, tor-browser#40698, and Bug
Fix issue in https-e wasmtor-browser#40706. However, it is a temporary workaround, that we should revert once https://bugzilla.mozilla.org/show_bug.cgi?id=1744719 is fixed.