I just reset Firefox because it told me that it was running slow and could be fixed that way. It works perfectly but there is this annoying bar on the bottom of my screen and I don't know what it is. It doesn't have any icons and is only about a cm high. It matches my theme as well, but doesn't go away when I change my theme. I can't figure out how to get rid of it or find someone else with the same problem. Please help! And thank you.