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Firefox does not respect macOS system audio playback routing

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I am using the latest Firefox 65 on macOS 10.13.6.

Issue: No audio playback can be heard through the browser. I am using a Soundcraft Signature 22 MTK multi-channel interface where audio playback is routed through channels 21/22 through Audio Midi settings in macOS.

It seems that Firefox is hard coded (and incorrectly assumes) all systems will default to channels 1-2 for audio playback.

I can tell it's defaulting to 1-2 because if I route audio to those channels in macOS and then us the USB return on those channels on my console, I can hear sound.

It should be respecting how audio is routed at the system level.

I am using the latest Firefox 65 on macOS 10.13.6. Issue: No audio playback can be heard through the browser. I am using a Soundcraft Signature 22 MTK multi-channel interface where audio playback is routed through channels 21/22 through Audio Midi settings in macOS. It seems that Firefox is hard coded (and incorrectly assumes) all systems will default to channels 1-2 for audio playback. I can tell it's defaulting to 1-2 because if I route audio to those channels in macOS and then us the USB return on those channels on my console, I can hear sound. It should be respecting how audio is routed at the system level.
Attached screenshots

Modified by zerodistraction

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Application

  • Firefox 65.0
  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:65.0) Gecko/20100101 Firefox/65.0
  • Support URL: https://support.mozilla.org/1/firefox/65.0/Darwin/en-CA/

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