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First release candidate for Tor Browser 7.0 is available for testing


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Finally, the first release candidate for Tor Browser 7.0 is ready for testing. Bundles can be found on https://people.torproject.org/~gk/builds/7.0-build1/ Depending on our Q&A results for this release candidate Tor Browser 7.0 will get released later next week (Tuesday/Wednesday) or early in the week thereafter with the switch to Firefox ESR 52.2.0.


So, please, give this release candidate a thorough test! This is the first stable release which is based on Firefox ESR 52 (52.1.2esr). We updated all of our patches that did not get upstreamed yet and made Torbutton and Tor Launcher multiprocess (e10s) compatible.


We hope having e10s and Mozilla's content sandbox enabled will be one of the major new features in the Tor Browser 7.0 series, both security- and performance-wise. While we are still working on the sandbox part for Windows[1] (the e10s part is ready), both Linux and macOS have e10s and content sandboxing enabled by default in Tor Browser 7.0. Linux and OS X users have in addition to that the option to harden their Tor Browser setup by using only Unix Domain sockets for communication with tor.


The highlights in our tracking and fingerprinting resistance improvements are: cookies, view-source requests and permissions are isolated to the first party URL bar domain now to enhance our tracking related defenses. On the fingerprinting side we disabled and/or patched several new features, among them WebGL2, the WebAudio, Social, SpeechSynthesis, and Touch APIs, and the MediaError.message property.


With the switch to ESR52 new minimal system requirements for Tor Browser arrived as well: Tor Browser 7.0 is the first stable release which requires SSE2 on Windows machines and OS X 10.9+ for Apple computers. Furthermore, Linux users need to have PulseAudio available now for audio support in their browsers. Apart from switching to the new Firefox ESR and dealing with related issues we included a new Tor stable version ( and updated our NoScript (5.0.5) and HTTPS-Everywhere versions (5.2.17).


We updated our toolchains during the ESR transition as well. In particular we retired the old GCC-based one for our macOS cross-compilation and rely solely on clang/cctools now. There are known issues/unfinished ESR52 transision work that can be followed in our bug tracker[2][3]. We hope to get those remaining bugs resolved as soon as possible.


The full changelog since Tor Browser 6.5.2 is:

Tor Browser 7.0 -- June 6 2017
 * All Platforms
   * Update Firefox to 52.1.2esr
   * Update Tor to
   * Update Torbutton to
     * Bug 22104: Adjust our content policy whitelist for ff52-esr
     * Bug 22457: Allow resources loaded by view-source://
     * Bug 21627: Ignore HTTP 304 responses when checking redirects
     * Bug 22459: Adapt our use of the nsIContentPolicy to e10s mode
     * Bug 21865: Update our JIT preferences in the security slider
     * Bug 21747: Make 'New Tor Circuit for this Site' work in ESR52
     * Bug 21745: Fix handling of catch-all circuit
     * Bug 21547: Fix circuit display under e10s
     * Bug 21268: e10s compatibility for New Identity
     * Bug 21267: Remove window resize implementation for now
     * Bug 21201: Make Torbutton multiprocess compatible
     * Translations update
   * Update Tor Launcher to
     * Bug 22283: Linux 7.0a4 broken after update due to unix: lines in
     * Bug 20761: Don't ignore additional SocksPorts
     * Bug 21920: Don't show locale selection dialog
     * Bug 21546: Mark Tor Launcher as multiprocess compatible
     * Bug 21264: Add a README file
     * Translations update
   * Update HTTPS-Everywhere to 5.2.17
   * Update NoScript to 5.0.5
   * Update Go to 1.8.3 (bug 22398)
   * Bug 21962: Fix crash on about:addons page
   * Bug 21766: Fix crash when the external application helper dialog is
   * Bug 21886: Download is stalled in non-e10s mode
   * Bug 21778: Canvas prompt is not shown in Tor Browser based on ESR52
   * Bug 21569: Add first-party domain to Permissions key
   * Bug 22165: Don't allow collection of local IP addresses
   * Bug 13017: Work around audio fingerprinting by disabling the Web
Audio API
   * Bug 10286: Disable Touch API and add fingerprinting resistance as
   * Bug 13612: Disable Social API
   * Bug 10283: Disable SpeechSynthesis API
   * Bug 22333: Disable WebGL2 API for now
   * Bug 21861: Disable additional mDNS code to avoid proxy bypasses
   * Bug 21684: Don't expose navigator.AddonManager to content
   * Bug 21431: Clean-up system extensions shipped in Firefox 52
   * Bug 22320: Use preference name 'referer.hideOnionSource' everywhere
   * Bug 16285: Don't ship ClearKey EME system and update EME preferences
   * Bug 21675: Spoof window.navigator.hardwareConcurrency
   * Bug 21792: Suppress MediaError.message
   * Bug 16337: Round times exposed by Animation API to nearest 100ms
   * Bug 21972: about:support is partially broken
   * Bug 21726: Keep Graphite support disabled
   * Bug 21323: Enable Mixed Content Blocking
   * Bug 21685: Disable remote new tab pages
   * Bug 21790: Disable captive portal detection
   * Bug 21686: Disable Microsoft Family Safety support
   * Bug 22073: Make sure Mozilla's experiments are disabled
   * Bug 21683: Disable newly added Safebrowsing capabilities
   * Bug 22071: Disable Kinto-based blocklist update mechanism
   * Bug 22415: Fix format error in our pipeline patch
   * Bug 22072: Hide TLS error reporting checkbox
   * Bug 20761: Don't ignore additional SocksPorts
   * Bug 21862: Rip out potentially unsafe Rust code
   * Bug 16485: Improve about:cache page
   * Bug 22462: Backport of patch for bug 1329521 to fix assertion failure
   * Bug 21340: Identify and backport new patches from Firefox
   * Bug 22153: Fix broken feeds on higher security levels
   * Bug 22025: Fix broken certificate error pages on higher security levels
   * Bug 21887: Fix broken error pages on higher security levels
   * Bug 22458: Fix broken `about:cache` page on higher security levels
   * Bug 21876: Enable e10s by default on all supported platforms
   * Bug 21876: Always use esr policies for e10s
   * Bug 20905: Fix resizing issues after moving to a direct Firefox patch
   * Bug 21875: Modal dialogs are maximized in ESR52 nightly builds
   * Bug 21885: SVG is not disabled in Tor Browser based on ESR52
   * Bug 17334: Hide Referer when leaving a .onion domain (improved patch)
   * Bug 18531: Uncaught exception when opening ip-check.info
   * Bug 18574: Uncaught exception when clicking items in Library
   * Bug 22327: Isolate Page Info media previews to first party domain
   * Bug 22452: Isolate tab list menuitem favicons to first party domain
   * Bug 15555: View-source requests are not isolated by first party domain
   * Bug 3246: Double-key cookies
   * Bug 8842: Fix XML parsing error
   * Bug 5293: Neuter fingerprinting with Battery API
   * Bug 16886: 16886: "Add-on compatibility check dialog" contains
Firefox logo
   * Bug 19645: TBB zooms text when resizing browser window
   * Bug 19192: Untrust Blue Coat CA
   * Bug 19955: Avoid confusing warning that favicon load request got
   * Bug 20005: Backport fixes for memory leaks investigation
   * Bug 20755: ltn.com.tw is broken in Tor Browser
   * Bug 21896: Commenting on website is broken due to CAPTCHA not being
   * Bug 20680: Rebase Tor Browser patches to 52 ESR
   * Bug 22429: Add IPv6 address for Lisbeth:443 obfs4 bridge
   * Bug 22468: Add default obfs4 bridges frosty and dragon
 * Windows
   * Bug 22419: Prevent access to file://
   * Bug 12426: Make use of HeapEnableTerminationOnCorruption
   * Bug 19316: Make sure our Windows updates can deal with the SSE2
   * Bug 21868: Fix build bustage with FIREFOX_52_0_2esr_RELEASE for Windows
 * OS X
   * Bug 21940: Don't allow privilege escalation during update
   * Bug 22044: Fix broken default search engine on macOS
   * Bug 21879: Use our default bookmarks on OSX
   * Bug 21779: Non-admin users can't access Tor Browser on macOS
   * Bug 21723: Fix inconsistent generation of MOZ_MACBUNDLE_ID
   * Bug 21724: Make Firefox and Tor Browser distinct macOS apps
   * Bug 21931: Backport OSX SetupMacCommandLine updater fixes
   * Bug 15910: Don't download GMPs via the local fallback
 * Linux
   * Bug 16285: Remove ClearKey related library stripping
   * Bug 22041: Fix update error during update to 7.0a3
   * Bug 22238: Fix use of hardened wrapper for Firefox build
   * Bug 21907: Fix runtime error on CentOS 6
   * Bug 15910: Don't download GMPs via the local fallback
 * Android
   * Bug 19078: Disable RtspMediaResource stuff in Orfox
 * Build system
   * Windows
     * Bug 21837: Fix reproducibility of accessibility code for Windows
     * Bug 21240: Create patches to fix mingw-w64 compilation of Firefox
ESR 52
     * Bug 21904: Bump mingw-w64 commit to help with sandbox compilation
     * Bug 18831: Use own Yasm for Firefox cross-compilation
   * OS X
     * Bug 21328: Updating to clang 3.8.0
     * Bug 21754: Remove old GCC toolchain and macOS SDK
     * Bug 19783: Remove unused macOS helper scripts
     * Bug 10369: Don't use old GCC toolchain anymore for utils
     * Bug 21753: Replace our old GCC toolchain in PT descriptor
     * Bug 18530: ESR52 based Tor Browser only runs on macOS 10.9+
     * Bug 22328: Remove clang PIE wrappers
   * Linux
     * Bug 21930: NSS libraries are missing from mar-tools archive
     * Bug 21239: Adapt Linux Firefox descriptor to ESR52 (use GTK2)
     * Bug 21960: Linux bundles based on ESR 52 are not reproducible anymore
     * Bug 21629: Fix broken ASan builds when switching to ESR 52
     * Bug 22444: Use hardening-wrapper when building GCC
     * Bug 22361: Fix hardening of libraries built in linux/gitian-utils.yml


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