Tor Browser 6.0a5-hardened is released

A new hardened Tor Browser release is available. It can be found in the 6.0a5-hardened distribution directory and on the download page for hardened builds.

This release features important security updates to Firefox.

It contains a bunch of noteworthy changes. We switched the browser to Firefox ESR 45 and rebased our old patches/wrote new ones where necessary. We also ship a new Tor alpha version, 0.2.8.2, which makes meek usable again and contains a number of other improvements/stability fixes.

Note: There is no incremental update from 6.0a3-hardened available due to bug 17858. The internal updater should work, though, doing a complete update.

Here is the complete changelog since 6.0a4-hardened:

Tor Browser 6.0a5-hardened — April 28 2016

• All Platforms
  • Update Firefox to 45.1.0esr
  • Update Tor to 0.2.8.2-alpha
  • Update Torbutton to 1.9.5.3
    • Bug 18466: Make Torbutton compatible with Firefox ESR 45
    • Translation updates
  • Update Tor Launcher to 0.2.8.4
    • Bug 13252: Do not store data in the application bundle
    • Bug 10534: Don’t advertise the help desk directly anymore
    • Translation updates
  • Update HTTPS-Everywhere to 5.1.6
  • Update NoScript to 2.9.0.11
  • Update meek to 0.22 (tag 0.22-18371-2)
    • Bug 18371: Symlinks are incompatible with Gatekeeper signing
  • Bug 15197 and child tickets: Rebase Tor Browser patches to ESR 45
  • Bug 18900: Fix broken updater on Linux
  • Bug 18042: Disable SHA1 certificate support
  • Bug 18821: Disable libmdns support for desktop and mobile
  • Bug 18848: Disable additional welcome URL shown on first start
  • Bug 14970: Exempt our extensions from signing requirement
  • Bug 16328: Disable MediaDevices.enumerateDevices
  • Bug 16673: Disable HTTP Alternative-Services
  • Bug 17167: Disable Mozilla’s tracking protection
  • Bug 18603: Disable performance-based WebGL fingerprinting option
  • Bug 18738: Disable Selfsupport and Unified Telemetry
  • Bug 18799: Disable Network Tickler
  • Bug 18800: Remove DNS lookup in lockfile code
  • Bug 18801: Disable dom.push preferences
  • Bug 18802: Remove the JS-based Flash VM (Shumway)
  • Bug 18863: Disable MozTCPSocket explicitly
  • Bug 15640: Place Canvas MediaStream behind site permission
  • Bug 16326: Verify cache isolation for Request and Fetch APIs
  • Bug 18741: Fix OCSP and favicon isolation for ESR 45
  • Bug 16998: Disable for now
  • Bug 17506: Reenable building hardened Tor Browser with startup cache
  • Bug 18898: Exempt the meek extension from the signing requirement as well
  • Bug 18899: Don’t copy Torbutton, TorLauncher, etc. into meek profile
  • Bug 18890: Test importScripts() for cache and network isolation
  • Bug 18726: Add new default obfs4 bridge (GreenBelt)
• Build System
  • Bug 16224: Don’t use BUILD_HOSTNAME anymore in Firefox builds
  • Bug 18699: Stripping fails due to obsolete Browser/components directory
  • Bug 18698: Include libgconf2-dev for our Linux builds

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