GitLab is used only for code review, issue tracking and project management. Canonical locations for source code are still https://gitweb.torproject.org/ https://git.torproject.org/ and git-rw.torproject.org.
git range-diff v81.1.0-beta.1..tor-browser-81.1.0b1-10.0-1 v81.1.1..tor-browser-81.1.1-10.0-1
This will create a new commit in order to revert the existing changes.
