Firefox [1] was giving me fits. It would work fine except when I quit the application, then it would just sit there consuming over 100% of the CPU (Central Processing Unit) (not hard given I have multiple CPUs on the machine). I even rebooted the machine on the off chance that Firefox thought it was running on a Windows box and not a Mac. But no, Firefox kept freezing when I quit the application.
I was afraid that somehow some critical file got corrupted and that I would have to nuke all my Firefox settings and start over again. But before I do that, let me just … maybe? clear the cache?
Yup. Clearing the cache fixed the issue. And upon thinking of it, I don't think I've bothered to clean the cache since … 2015? Really? It's been that long? Wow.