Hello,
There is a GitLab ticket open to track this error and a workaround:
While we’re waiting for someone to figure out why this is happening, you can get it working on Windows 10 by setting Tor’s firefox.exe to run in Windows 7 compatibility mode:
- Right-clicking on Tor’s firefox.exe, and select properties
- In the “Compatibility” tab, check the box that says “Run this program in compatibility mode for”, and set the dropdown box to Windows 7
Let us know if that works for you.