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, 0.3.5.3-alpha, 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: