Something you should try is [[Troubleshoot Firefox issues using Safe Mode|running Firefox in Safe Mode]] to see if it's more stable. The crashing could be caused by an installed add-on that's not working properly with the new version of Firefox. If Firefox doesn't crash in Safe Mode, it's like an add-on related issue. However, it could also indicate that the issue is related to hardware acceleration. You can also try [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems#w_turn-off-hardware-acceleration|turning that off]] to see if the issue goes away. [[Upgrade your graphics drivers to use hardware acceleration and WebGL|Updating or reinstalling your graphics drivers]] is also a good thing to try. If none of that helps and the issue still happens when you are in Safe Mode, you may want to [[Troubleshoot and diagnose Firefox problems#w_4-reinstall-firefox|try reinstalling Firefox]]. This will ensure that the issue isn't caused by damaged or missing files due to the update. If that still doesn't work, it would be best if you could [[Firefox crashes - asking for support|provide us with some crash reports]] (if any). This will give us a lot more details about the crashes that you are experience and hopefully help to fix the problem. Hope this helps.