Try running Firefox in Safe Mode to see if the issue is still present there. I've seen this issue before and I believe it was fixed by disabling hardware acceleration, so that could very well be the solution.

Other than that, if the issue doesn't happen in Safe Mode, it could be caused by an extension.

If the issue still happens in Safe Mode, check to make sure that your security software on your computer is not interfering with Firefox's access to files.

Hope this helps.

Hi Wesley thanks for the suggestions. These did not work though. Firefox continued to crash with the same box opening up with Hardware acceleration disabled and in safe mode.

I'm trying to see if the security software interferes but I doubt that's it because it usually notifies if it stops anything.

do you have any 3rd-party software that might hook into windows explorer like dropbox, onedrive and others? those might also inject dlls into the browser process and cause instability...

Did you check the Windows Event log?