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I am unable to get sound when using firefox but I do get it with explorer. What have I screwed up?

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I discovered that I have no sound when using firefox but have it when I open with explorer. I found this out when going to hulu but don't go there too often so I don't know when this started.

I discovered that I have no sound when using firefox but have it when I open with explorer. I found this out when going to hulu but don't go there too often so I don't know when this started.

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You only have the Flash 10.1 r85 plugin installed and no other plugins like the Windows Media Player.

See What to do if Firefox won't play any sounds and Fix common audio and video issues

See also Use plugins to play audio, video, games and more