I'm a new firefox user and have never done an update. Evidently the upgrade downloaded automatically and when I restarted my computer this morning I got messages from an unidentified source saying " Hi... we've seen got some updates for your computer... don't turn off your pc." How do I know if this message is from firefox or a virus? If it's you why don't you identify yourselves? The messages have been flashing on my screen for over an hour. If I don't get an answer I'm going back to chrome.