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Firefox stuck with audio device disconnected

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Hi, I have a sound interface on OS X 10.11 but firefox is stuck with an audio output pair which is not the one i picked on the system.

This results in all my other applications working fine (itunes, vlc etc) but firefox outputing no sound at all.

Do you know how to change the audio output for Firefox on OS X 10.11 ?

many thansks

Hi, I have a sound interface on OS X 10.11 but firefox is stuck with an audio output pair which is not the one i picked on the system. This results in all my other applications working fine (itunes, vlc etc) but firefox outputing no sound at all. Do you know how to change the audio output for Firefox on OS X 10.11 ? many thansks

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To be more accurate: OS X 10.11, Firefox 78. Audio interface is a 828x. Everything works fine on my Output Pair 3-4 on which everything is connected being Mac OS audio main output and firefox does not work with another pair than 1-2.