Please consider turning on send info to Mozilla from with in Firefox before posting a question. This helps us help you. I have no info from your system that would help see things that cause issues. So I have nothing. I would have a list of your video card drivers and any errors that are being experienced. Suggest you find updated drivers for your card as old and corrupted drivers along with mis-configured settings are usually the issue. Please make sure that Hardware Acceleration is turned on in firefox.