Are you on 84b1 or more? If so, try exiting and restarting it once manually. If you upgraded from a version running with Rosetta, the restart initiated by Firef

Are you on 84b1 or more? If so, try exiting and restarting it once manually. If you upgraded from a version running with Rosetta, the restart initiated by Firefox will keep it running with Rosetta. This is tracked in https://bugzilla.mozilla.org/show_bug.cgi?id=1677036 https://bugzilla.mozilla.org/show_bug.cgi?id=1677036