I don't think this is a FF problem because it also happens when I use IE 10 but I always get better help here than Youtube or IE. When I am watching a video at Youtube the progress bar keeps appearing and disappearing every few seconds as if you moved the mouse. I tried moving the mouse to an area off the screen and turning it off (the mouse, it's a Microsoft 3500 wireless) but that made no difference, it just keeps appearing and disappearing every few seconds. It does exactly the same thing if I use IE10 so I don't think it's a FF add-on or app. I never use IE10 so I don't have a bunch of apps loaded on it. Other video sites don't do this so I believe it is a Yotube problem. It just started happening two days ago. Anybody else have this problem? Or a solution?