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How can I get html5 player audio to work on this browser?

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The html5 player video runs but I cannot hear the audio. In Internet Explorer this works fine. How can I get html5 player audio to work on this browser?

The html5 player video runs but I cannot hear the audio. In Internet Explorer this works fine. How can I get html5 player audio to work on this browser?

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Could you check whether Firefox is muted? On my system, I click the volume icon in the "notification area" of the Taskbar (also known as the tray) and then click a Mixer link. This shows the individual per-application volume controls. I have attached a screen shot for reference.