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I found out, that the getUserMedia Promise in Firefox only resolves, if the Tab is active or by clicking on the Tab Instance: (Firefox, 81.0)
navigator.mediaDevices.getUserMedia({ audio: true}).then(() => console.log("done"))
Otherwise, the Promise never resolves or rejects. Is this a bug or a feature, and where is this documented? Is there a media Config setting, to tell Firefox to allow getUserMedia Promise to resolve in non-active Tabs? Otherwise this looks like a bug for me...
I found out, that the getUserMedia Promise in Firefox only resolves, if the Tab is active or by clicking on the Tab Instance: (Firefox, 81.0)
navigator.mediaDevices.getUserMedia({ audio: true}).then(() => console.log("done"))
Otherwise, the Promise never resolves or rejects. Is this a bug or a feature, and where is this documented? Is there a media Config setting, to tell Firefox to allow getUserMedia Promise to resolve in non-active Tabs? Otherwise this looks like a bug for me...
Solution: "Firefox Autoplay"
about:preferences -> Security -> Autoplay
Audio Autoplay for background Tabs/Windows is not allowed due to the strict Media Policy. The Autoplay setting bypasses the Policy and allows audio to be played for non-active Tabs/Windows (Tabs/Windows in Background)
Edit (2020-12-01)
After a little testing and investigation, I found out that playing Audio in non-focused Firefox Tabs/Window is possible with Autoplay. But unfortunately, it is still not possible to bypass the strict policy when it comes to WebRTC/SIP. The Promise stil doesn't resolve, even with Autoplay enabled for all Sites.
Read this answer in context
Solution: "Firefox Autoplay"
about:preferences -> Security -> Autoplay
Audio Autoplay for background Tabs/Windows is not allowed due to the strict Media Policy. The Autoplay setting bypasses the Policy and allows audio to be played for non-active Tabs/Windows (Tabs/Windows in Background)
Edit (2020-12-01)
After a little testing and investigation, I found out that playing Audio in non-focused Firefox Tabs/Window is possible with Autoplay. But unfortunately, it is still not possible to bypass the strict policy when it comes to WebRTC/SIP. The Promise stil doesn't resolve, even with Autoplay enabled for all Sites.
about:preferences -> Security -> Autoplay
Audio Autoplay for background Tabs/Windows is not allowed due to the strict Media Policy. The Autoplay setting bypasses the Policy and allows audio to be played for non-active Tabs/Windows (Tabs/Windows in Background)
'''Edit (2020-12-01)'''
After a little testing and investigation, I found out that playing Audio in non-focused Firefox Tabs/Window is possible with Autoplay. But unfortunately, it is still not possible to bypass the strict policy when it comes to WebRTC/SIP. The Promise stil doesn't resolve, even with Autoplay enabled for all Sites.
