I've had a few problems of late myself, but not as bad as yours.
I suspect one of my extensions is causing the trouble, but I've been too lazy too start FF in safe mode to see if the problem replicates.
But after all the time I've spent tweaking it the way I like it, I'm not about to jettison the browser.
I tried Opera for about 2 minutes and hated it, and IE just irks the Hell out of me.
I'm hoping that extension updates will correct the bug that makes it crash.