My absolutely largest issue with Firefox is how settings revert after updates without any notice. It is good that updates are frequent. It is bad that settings revert and defaults are not safe.
I'll never touch Chrome again.
I'll never touch Chrome again.
If anything, I've noticed more and more settings are getting pushed into Sync and automatically propagate across instances or upon new installation. Which is nice.
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.