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Speakers don't work since I upgraded Firefox, no YouTube, streaming, music CDs, nothing

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The speakers worked fine. I upgraded Firefox and now cannot hear anything - music CDs, Youtube, other audio links, live streaming. I only hear the computer's Windows start-up refrain when I turn it on. That's all.

This happened

Every time Firefox opened

== I upgraded to 3.6.3

The speakers worked fine. I upgraded Firefox and now cannot hear anything - music CDs, Youtube, other audio links, live streaming. I only hear the computer's Windows start-up refrain when I turn it on. That's all. == This happened == Every time Firefox opened == I upgraded to 3.6.3

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I have a similar problem: my sound goes off when I watch youtube or flash videos. If I close Firefox and restart, the sound comes back, but stops again after a few minutes.