[ubuntu] Sound is muted only when I play online game

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http://ubuntuforums.org – I'm running Ubuntu 10.04,using Firefox to play QuakeLive online.Quake just had an updated plugin ,and it mutes my sound every time I try to play a game,everything else is the same. I can make sound come back for the pc by going to sound preferences, and checking mute, then unchecking.I tried removing the extension,and reinstalling,but that didn't work. Anyone have any suggestions?I have a post on the Quake forums, but no solution yet. (Hardware)