I got this weird sound issue on Firefox, which I've noticed on a lot of YouTube videos. Normally this happens in sound mixer:
But then, when navigating to another YouTube video this happens:
I didn't change any setting or anything – I'm confused. I should also mention that besides my main output source there is a USB headset output... if this has anything to do with my problem.
Adobe Flash Player
in there at all. On another note, do you have the same issue if you remove the USB headset? Flash vs. HTML5 should not make a difference.