FF running, dark reader
I have 2 questions. 1) I don't understand why Firefox often "closes badly". During a restart, I often get the error message "we must close the old Firefox". It happened even after a complete restart of the computer. How do you close it completely the first time? 2) I have used Dark Reader which has a good reputation and is useful. However, it slowed Firefox down considerably until it crashed. I deleted it, but some of the pages it had blacked out ... remain so when I reload them. How to solve this problem.