Recently i was promoted to refresh my ff settings, and upon restarting, all my settings and plugins were set back up 0. Not a pleasant experience rebuilding my ff instance, but i guess it's better now than before.
I had an issue with v73 being incompatible with whatever security software my Work PC was running and the main rendering thread crashing. After trying numerous things including rolling back to v72 and refreshing my profile, I came across a bug indicating it was scheduled to be fixed in an upcoming release which turned out to be v73.0.1 thankfully.
That's the first time I can recall where Firefox did me wrong.