[tor-qa] Tor Browser 7.0a3 is ready for testing

Georg Koppen gk at torproject.org
Sun Apr 16 20:01:00 UTC 2017

Hi all!

Tor Browser 7.0a3 is ready for testing. Candidate bundles for this alpha
release can be found on:


This is the first alpha release which is based on Firefox ESR 52. We
updated all of our patches that did not get upstreamed yet and made
Torbutton and Tor Launcher multiprocess (e10s) compatible. After the
first nightly build based on ESR52[1] we already fixed a number of bugs
associated with this switch. But more remain, please help!

We hope having e10s and Mozilla's content sandbox enabled will be one of
the major new features in the upcoming Tor Browser 7.0 series, both
security- and performance-wise. While we are still working on the
sandbox part for Windows, both Linux and macOS have e10s and content
sandboxing enabled by default in Tor Browser 7.0a3. There are already a
number of bugs related to that on our radar which can be found on our
bug tracker and which are tagged with the `tbb-e10s` keyword.[2] If you
find more, please report them!

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. Still, we need
to deal with new reproducibility issues (on Linux) which we hope to have
fixed in the final 7.0a3 alpha release.[3]

Apart from switching to the new ESR and dealing with related issues we
included a new Tor alpha ( and updated our NoScript (5.0.2)
and HTTPS-Everywhere versions (5.2.14). The sandboxed Tor Browser for
Linux got updated to 0.0.5 making sure it is compatible with Firefox ESR 52.

As in the upcoming Tor Browser 6.5.2 we provide a fix for Tor Browser
crashing on github.com on Windows and Twitter issues that got reported
already a while ago. We updated our security slider as well taking newer
JIT preferences into account.

Please test this release candidate and later on the alpha as we only
have this one and probably another alpha release to get Tor Browser 7.0
into a stable shape. All tickets for the remaining 7.0 alphas on our
radar can be found with the `tbb-7.0-must-alpha` keyword[4], all related
to our ESR52 switch with the `ff52-esr` one.[5]

The full changelog since Tor Browser 7.0a2 is:

Tor Browser 7.0a3 -- April 20 2017
 * All Platforms
   * Update Firefox to 52.1.0esr
   * Tor to
   * Update Torbutton to
     * 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 0.2.12
     * 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 5.2.14
   * Update NoScript to 5.0.2
   * Update sandboxed-tor-browser to 0.0.5
     * Bug 21764: Use bubblewrap's `--die-with-parent` when supported
     * Fix e10s Web Content crash on systems with grsec kernels
     * Bug 21928: Force a reinstall if an existing hardened bundle is
     * Bug 21929: Remove hardened/ASAN related code
     * Bug 21927: Remove the ability to install/update the hardened bundle
     * Bug 21244: Update the MAR signing key for 7.0
     * Bug 21536: Remove asn's scramblesuit bridge from Tor Browser
     * Add `prlimit64` to the firefox system call whitelist
     * Fix compilation with Go 1.8
     * Use Config.Clone() to clone TLS configs when available
   * Update Go to 1.7.5 (bug 21709)
   * Bug 21555+16450: Don't remove Authorization header on subdomains
(e.g. Twitter)
   * Bug 21887: Fix broken error pages 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 3246: Double-key cookies
   * Bug 8842: Fix XML parsing error
   * Bug 16886: 16886: "Add-on compatibility check dialog" contains
Firefox logo
   * 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 21917: Add new obfs4 bridges
   * Bug 21918: Move meek-amazon to d2cly7j4zqgua7.cloudfront.net backend
 * Windows
   * Bug 21795: Fix Tor Browser crashing on github.com
   * 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 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
 * Linux
   * Bug 21907: Fix runtime error on CentOS 6
   * Bug 21748: Fix broken Snowflake build and update bridge details
   * Bug 21954: Snowflake breaks the 7.0a3 build
 * 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+
   * Linux
     * Bug 21930: NSS libraries are missing from mar-tools archive
     * Bug 21239: Adapt Linux Firefox descriptor to ESR52 (use GTK2)
     * Bug 21629: Fix broken ASan builds when switching to ESR 52


[1] https://lists.torproject.org/pipermail/tbb-dev/2017-April/000501.html
[3] https://trac.torproject.org/projects/tor/ticket/21960

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