Feature #16356: Upgrade to Tor Browser 9.0 (based on Firefox 68)
Deal with Torbutton being integrated into Tor Browser
Upstream ticket: https://trac.torproject.org/projects/tor/ticket/10760
If upstream manages to add a hidden pref to disable it, we should be good. Otherwise, our Unsafe Browser is in trouble.
This change should land in Tor Browser 9.0a1, which should get out end of March/begin of April.