Here's one for any techies. For updates (or download). does Firefox for Windows use AppX Deployment Server (dll) directly or via maybe Windows App Installer? I don't understand any of this stuff but the dll is faulty and is destroying every Windows app which foolishly tries to update with it. I beieve it's just done for Windows App Installer among its many scalps I can't system restore, probably due to a dodgy disk drive. I don't want to lose Firefox. Help!