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Sound on Facebok videos

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I am running Windows 10 Enterprise version on my desktop.

The same video on Facebook plays perfectly on Chrome but the sound is muted when it is played on Firefox. It happens only recently.

Is there some control features that I should turn on or turn off somewhere so that I can continue to use Facebook a usual on my Desk top.

I am running Windows 10 Enterprise version on my desktop. The same video on Facebook plays perfectly on Chrome but the sound is muted when it is played on Firefox. It happens only recently. Is there some control features that I should turn on or turn off somewhere so that I can continue to use Facebook a usual on my Desk top.

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Does it still happen in Troubleshoot Mode?