Firefox endless crashing ...

[joe at actionline.com]

On Linux Mint 17 Firefox 46 is crashing in numerous
situations, including even when I try to run in safe mode,
it just crashes. Everything else on my system is working
fine and the system is up to date.

I have tried reinstalling Firefox; even tried complete
uninstall and fresh install.  But the problem continues t
the same.

Cannot open either extensions or add-ons because Firefox
instantly crashes.

Tried opening a private window and then I could get to
extensions and add-ons, so I disabled them all, but
when I restart Firefox, it crashes again.

Help!