Same issue here. But this is no problem of pc performance. The CPU and RAM values haven’t increased.
But I can maybe add something which is usefull for you.
My firefox freezes when i load a game. After a while a window appears, where I can stop the plug in. If I stop it, I can see the add and the game starts loading for a really short time, but crashes again.
If I then click on “stop plug in” again I can see the flash player error “screen” istead of the game.