Update Torbutton to use new TorBrowser prefs
We need to update Torbutton to use the prefs from #2949 (moved) and #2950 (closed).
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information
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.
We need to update Torbutton to use the prefs from #2949 (moved) and #2950 (closed).