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Firefox 57.0.2 is unable to play sound after switching to this Windows release. Also affects Nightly and Developers edition eg youtube video plays on chrome/edge not on firefox.

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3

Logged and confirmed as a known issue by Microsoft.

Microsoft response Windows has several audio volume APIs - IAudioEndpointVolume, IChannelAudioVolume, ISimpleAudioVolume, and IAudioEndpointVolume. These APIs can be used to change the volume and/or mute state of the stream, app, or audio device.

In build 17063 a change was made to these APIs to have them return S_FALSE (1) if the requested change was a no-op.

This broke apps (like Firefox) which request changes (that may be no-ops) and then explicitly check the return value against S_OK (0).

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It was determined to be a Firefox bug. The problem has been fixed in Nightly, and should make its way to 58 beta, 57 release and 52 ESR as soon as possible

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