I had a problem yesterday which I have never experienced before. Not sure it was Firefox but that is what was open when I tried to turn the computer off.
It simply would not turn off, not even show any indication that it was trying to close. I finally just held the on/off button until it finally closed.
When I turned it back on I just clicked “open windows normally’ and have had no more problems today. It was odd tho as like I said, never happened before.
Had the same thing happen, restarted in safe mode and ran virus scans, nothing found. Restarted normally, ran Windows Update, installed important updates.
Once an exploit is published, meaning Microsoft has a patch available, dark web types rush to take advantage. Always good to stay on top of updates.
Firefox history had numerous entries stating attack attempt trying to obtain bank information. Didn't have the problem again after the Microsoft update was installed.
File this under For What It's Worth.