When I close completely out of Firefox, then later try re-opening it, it won't open. It acts like it wants to open but will not. The only other way to use Firefox after closing out of it, is by shutting my computer down completely. How else can this be fix? When i go to update Firefox, it says that the program is in use and cannot update till i close out of it, but I already closed out of Firefox... Whats going on? My Firefox version is 3.5.16, and my system is Windows 7.