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Why have all sounds stopped working in Firefox?

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The regular sounds from my computer are still working, but the sounds from the Internet have quit working completely. Videos will still play, but with no sound. I've reset mt internet connection and reloaded the sites, but nothing has worked so far.

The regular sounds from my computer are still working, but the sounds from the Internet have quit working completely. Videos will still play, but with no sound. I've reset mt internet connection and reloaded the sites, but nothing has worked so far.

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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.