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no sound on-works all over my computer-but after update no sound

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I use to have sound on my news pages but since I updated to 3.6.15 I HAVE NO SOUND EVERYTHING ELSE ON MY COMPUTER HAS SOUND NOTHING IS TURNED OFF WHAT GIVES--THANKS

I use to have sound on my news pages but since I updated to 3.6.15 I HAVE NO SOUND EVERYTHING ELSE ON MY COMPUTER HAS SOUND NOTHING IS TURNED OFF WHAT GIVES--THANKS

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See:

You can click the Volume icon on the Windows Taskbar near the clock and click the Mixer link at the bottom to open the mixer.
You can adjust the volume level for each application in that window, so make sure that Firefox is not muted or set at a low level.
You will only see the Firefox program in the Mixer if you are on a website that plays sound.

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thanks-sounds work everywhere else on my computer-just on FireFox is it out after the update