It could be your flashplayer. That's one of the worst softwares around in decades. 16 years of regular new error updates. So you could give it a try to update your flashplayer or try to restore your computer to a restore point from a time when it still worked.
And prior to that you could give Opera a try. As far as I know and have experienced, it's usually more stable than Firefox and Chrome. You can try the portable version
which doesn't install the programm deep in your system.