It is impossible to listen to music using Amarok (or to watch any movie using mplayer, vlc or totem) when I have an open tab in firefox with youtube movie in it. I doesn't have to be playing at all, being there is enough to cause problems.
It's REALLY annoying. I have to restart Amarok if I try to play something having any youtube movie open in firefox, because it freezes.
An the other way: If I listen to music using Amarok, or watch a movie using one of the players, I can watch a movie in youtube but without any sound.

So maybe something with sound drivers? Or something similar.

Any solutions?