[CentOS] Speaking of firefox updates

I haven't gone past 38, because when the 45 update came out, and video...
like, say, my *required* training from work, when I tried to run it, it
crashed firefox. Repeatedly. 100% of the time.

Has anyone been using the current version had trouble with video, etc? I'd
like to update, but not if I can't do required training....

         mark