New Alpha Release: Tor Browser 13.0a6 (Android, Windows, macOS, Linux)

by richard | September 29, 2023

Tor Browser 13.0a6 is now available from the Tor Browser download page and also from our distribution directory.

This release backports important security fixes from Firefox 115.3.1. There were no Android-specific security backports from Firefox 115.3.0.

Major Changes

This is our sixth alpha release in the 13.0 series which represents a transition from Firefox 102-esr to Firefox 115-esr. It is also our first release-candidate build for 13.0 stable. If you find any issues, please report them on our gitlab or on the Tor Project forum.

We have completed our annual esr transition audit, and the final reports should be available in our tor-browser-spec repository in the audits directory. All of the interesting upstream patches have either been disabled or found to not be a problem for us on closer inspection.

Build Output Naming Updates

As a reminder from the 13.0a3 release post, we have made the naming scheme for all of our build outputs mutually consistent. If you are a downstream packager or in some other way download Tor Browser artifacts in scripts or automation, you will have a bit more work to do beyond bumping the version number once the 13.0 alpha stabilizes. All of our current build outputs can be found in the distribution directory

Full changelog

We would like to thank volunteer contributor guest475646844 for their fix for tor-browser#41165. If you would like to contribute, our issue tracker can be found here.

The full changelog since Tor Browser 13.0a5 is:

This is a companion discussion topic for the original entry at

After new update, antivirus see: Trojan:Win32/Malgent!MTB
When its delete Tor not working


i have the same problem on desktop cant connect after the update.
It says that my connection is blocked… tried a bridge does not work :frowning:

We are aware Windows Defender flags Tor.exe, part of TorBrowser. So far, nothing seems to indicate this isn’t a false positive from that antivirus. Anecdotally, 12h ago, 4 antivirus flagged it according to VirusTotal, right now, only 3 still do.
If you believe it may be a virus, and the antivirus is right, you can install the 32bit version (available from this page), which seems unaffected.
If you don’t believe it’s a virus, and it’s actually a false positive, you can tell Windows Defender to unquarantine Tor.exe to fix you current installation.


Was the letterboxing algorithm changed? My window size covers more of the screen now vs the current Tor Browser release.

Yes! The changes were made in Tor Browser 13.0a2. Relevant ticket: Re-evaluate letterboxing dimension choices (#30556) · Issues · The Tor Project / Applications / Tor Browser · GitLab

actually, it’s Increase the max width of new windows (#33282) · Issues · The Tor Project / Applications / Tor Browser · GitLab

#33282 #30556 was to align LB steps with new win steps :slight_smile:

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