I was pressured to upgrade from Firefox 3.5 to a new series for school\n(online classes). I have tried the 4, 5, and 6 series and unfortunately I\nlost almost all ability to play any videos at all. Youtube doesn't play\nanymore, except rare exceptions, MSN, the news sites, weather sites, etc. I\ntried going back to version and they are still not playing. Any ideas? I\nreally prefer FF over IE.