Why is it, that no matter what version of Firefox I'm running, I can't install any plug-ion, theme, extension, ANYTHING! No matter what I try to download, for what version it always comes up with a pop-up error message. Normally I would think there is some option I didn't click, but the error message is usually different. Plus I'll get error messages about the plug-in not existing even on the most popular plug-ins which clearly do exist. I've attached 2 of the numerous error messages I get below. Firefox blows.