Tor Browser 7.5a5 is now available from the Tor Browser Project page and also from our distribution directory.

This release features important security updates to Firefox.

Besides the usual Firefox security and extensions updates this alpha contains a bunch of long-awaited features:

We include Tor 0.3.2.1-alpha, the first alpha release in the 0.3.2 series, with support for next generation onion services and a new circuit scheduler, KIST. Thanks to the work of Jed Davis we are able to ship a content sandbox for Linux users. While the content sandbox is disabled in Firefox 52 ESR versions, which Tor Browser is based on, backported patches allow us to protect our Linux users with the same mechanisms that are provided to regular Firefox users. The content sandbox is enabled for Windows users as well. While we still need to clean up our workarounds to get the sandboxing code to work with our mingw-w64 compiler, we think the enabled sandbox is ready for a wider testing in our alpha series. Please give it a try if you can. Although this change should be invisible to users, we switched our build system from gitian/tor-browser-bundle to rbm/tor-browser-build. The build should continue to be reproducible and if you want to do a build yourself the README file in the tor-browser-build repository has some informations.

Update: Tor Browser 7.5a5 is broken when using the sandboxed-tor-browser version 0.0.13, due to bug 23692. Version 0.0.14 of the sandboxed-tor-browser has been released to fix that issue.

Note: The release date in the changelog displayed after the update is incorrect. The actual release date is September 28.

The full changelog since Tor Browser 7.5a4 is: