I think I got an automatic update from Firefox a few weeks ago and it is/was a mess. It knocked out my ad blocker and finally I figured out how to get it back. It still is unresponsive a lot. They used to send an crash alert for me but even stopped doing that for me. Never did get a response about what to do about the problem.
I live with it for now as I heard some not so good things about Chrome. Daughter will be here in a couple of weeks and will have a look at it for me.