When playing flash videos on FF, the video often freezes/locks FF and the program says Not Responding. After a few seconds, things are fine. I looked online and disabled hardware acceleration, disabled protected mode, reinstalled, and updated drivers. Chrome and IE are fine. I have pretty much the same setup at work other than I am using Win8.1 at work, Win7 at home. No problems at work. Have not tried reinstalling FF yet. Was hoping to avoid that but will if needed.