Tor Browser 9.0a3 is now available from the Tor Browser Alpha download page and also from our distribution directory.

Note: this is an alpha release, an experimental version for users who want to help us test new features. For everyone else, we recommend downloading the latest stable release instead.

Similarly to Tor Browser 8.5.2 and Tor Browser 8.5.3 on the stable series, this release is fixing critical security updates in Firefox (mfsa2019-18 and mfsa2019-19).

Users of the safer and safest security levels were not affected by mfsa2019-18.

The full changelog since Tor Browser 9.0a2 is: