I updated to Firefox 85. Since then, at random times, if I quit Firefox and reopen it, it will freeze with a spinning beachball, and I have to Force Quit it. I have already followed the steps to “Refresh Firefox”, but it still happens.
With the help of a Firefox help article, I have found a fix, but it is only temporary, and I don’t recommend that anyone else try it unless they know what they’re doing. I have to go into my Firefox profile and delete any files or folders whose names begin with “sessionstore”. It is very strange. Before I shut down for the night last night, I opened Firefox again. It worked just fine. I closed it and shut down.
When I booted back up this morning, I thought Firefox was going to work, but it immediately froze once more. I am wondering if anyone else is seeing similar behavior with Firefox 85. If not, the next thing I need to do is figure out how to export all my bookmarks and start over with a truly fresh profile. Something is clearly corrupt, but I’m not sure what.
PS: Forgot to mention I’m still on 10.14.6, just as a data point.