New Release: Tor Browser 8.5a4

Tor Browser 8.5a4 is now available from the Tor Browser Project page and also from our distribution directory.

This release features important security updates to Firefox.

Highlights in Tor Browser 8.5a4 are a new Tor alpha version,, a fixed layout of our macOS installer window and Stylo (Mozilla’s new CSS engine) being enabled on macOS after fixing a reproducibility issues. Please report any problems you find with those macOS related changes as we think about backporting them for the stable series.

Moreover, we backport a defense against protocol handler enumeration developed by Mozilla engineers and provide Tor Browser on all supported platforms in four additional locales: cs, el, hu, and ka.

Note: It turned out it was a bit premature to ship the new locales as we did not catch bugs in them last minute, so we don’t make them available on our download page. Sorry for the inconvenience.

The full changelog since Tor Browser 8.5a3 is:

  • All Platforms
    • Update Firefox to 60.3.0esr
    • Update Tor to
    • Update Torbutton to 2.1.1
    • Update Tor Launcher to 0.2.17
    • Update HTTPS Everywhere to 2018.9.19
    • Update NoScript to
    • Bug 1623: Block protocol handler enumeration (backport of fix for #680300)
    • Bug 27905: Fix many occurrences of “Firefox” in about:preferences
    • Bug 28082: Add locales cs, el, hu, ka
  • Windows
    • Bug 21704: Abort install if CPU is missing SSE2 support
    • Bug 28002: Fix the precomplete file in the en-US installer
  • OS X
    • Bug 26263: App icon positioned incorrectly in macOS DMG installer window
    • Bug 26475: Fix Stylo related reproducibilitiy issue
  • Linux
    • Bug 26475: Fix Stylo related reproducibilitiy issue
    • Bug 28022: Use `/usr/bin/env bash` for bash invocation
  • Android
    • Backport of fixes for bug 1448014, 1458905, 1441345, and 1448305
  • Build System
    • All Platforms
      • Bug 27218: Generate multiple Tor Browser bundles in parallel
    • Windows
    • OS X



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