I've encountered a problem with Mozzilla FireFox. When ever I connect to the Internet, FireFox comes up since it's my default browser, but lately it comes up with a blank page. Clicking Home and Refresh does nothing so I close the window and try to open another FireFox window and it fails. It doesn't even boot up. I've even tried running firefox.exe and it's still a failure. I don't know what's going on with my computer. What could be the possible causes?