Today I suddenly had a problem signing in to my Gmail account, after I restarted my computer. Google requested that I clear my cookies and cache, which I did, but the error message persisted. I contacted Google support and was able to access Gmail through Chrome, so they determined it is a Firefox issue. What do I need to do, to get this issue resolved? Firefox is currently my default browser and I'd prefer to keep it that way but I need access to my Gmail. Please help?