Does your Firefox keep hanging? Try this before blaming Mozilla: go to Activity Monitor(Mac) or Task Manager(Windows) to kill flash process.
It always works for me.
As we all know, flash is dying. Thanks, Steve. But, please, die faster.
IE, I know you won’t die. You are too big to fail. But I will pray, please follow flash. In a world without flash and IE, we are much happier.