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Updated to Firefox 4, now no sound on Internet sites including YouTube. I've updated Adobe Flash.

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Op system WinXP pro with SR3 . Firefox 4.0.1 Internet based videos and music stations have no sound. mp3 files play fine. Windows chimes work ok. All channels on "Volume Control" turned up full.

Sound worked on some sites before I updated to Firefox 4.

Op system WinXP pro with SR3 . Firefox 4.0.1 Internet based videos and music stations have no sound. mp3 files play fine. Windows chimes work ok. All channels on "Volume Control" turned up full. Sound worked on some sites before I updated to Firefox 4.