Can't select output device in webmeeting in Firefox

[superralle]

Hello everyone,

using Firefox for webmeeting it says "no device found" for output devices in the settings dialog, this leads to not having any audio output at all.
Has the recent update that included the device switcher effectively broken compatability with firefox?
Is there maybe a workaround for this?

Any help would be greatly appreciated

Best Regards

Edit: I've also gone back to Firefox 60.2.2 ESR to confirm it's not an issue with the current Firefox version

Edit2: After Playing around some in "about:config" and emptying cache I still can't select an output device, however I do get audio output now. I reverted all the changes in "about:config" and it still works. I don't know as of now how to reproduce or fix the issue but I have some users who are experiencing the same problem

Edit3: if you set "media.sinkid.enabled" to true you can see the selected output device in the device switcher, however it's not possible to switch the device.

 

[superralle]

I could reproduce that leaving Firefox closed for some time and starting a webmeeting again it may select a different output device which may or may not be the default output device.
As I've said before, switching the ouput device doesn't work