Just noticed that when I open the exact same video in Opera or Chrome the sound is much louder than with Firefox. Very weird, I just listened to the Geohot-rap on Firefox and it was way more silent than in Chrome or Opera. And yes the volumebar of the actual video is the same. I watched the same Youtube video too with all three those browsers, and the same occurred, Chrome and Opera are much louder than Firefox. How can I fix this very weird problem?