I had to uninstall Flash from my PC yesterday as it was crashing with Firefox every minute (massive list of FF crash logs) and locking up my entire PC 3 times a week. Been through the reinstall cycle previously btw. The discussion forums on a solution go round in circles, one thing is sure: It's FF and Flash together, plus maybe some interaction with 64 bit OS and video drivers that lock up a machine. One of the warning signs of trouble is a jumping cursor.
What will happen , as before is that eventually I'll hit a site - be it internal corporate (e.g. interactive training) or an external essential service - that demands Flash. So will have to switch to IE for those reluctant moments.
Flash, begone forever out of my life (I wish).