Not wanting to rebuild my C:, I threw in MRI Customizer. Ran the updates, machine restarted after, and Firefox works again. With my luck just a band-aid until the wound begins bleeding again, but I dont have time this week to rebuild C:, so its good enough for now. Hell, not sure when I'll have the time to rebuild it. 3 bay garage to clean, which is destroyed inside within the next week, just so I can pick up 3 Willys Jeeps and begin the tedious process of making one out of 3.