Im trying to get my mic work on Discord, but I tried it with other websites like onlinemictest and get the same problem. It also doesn't happen on Chrome, so its most likely a Firefox issue. I also tried it on my laptop and it didnt work. Both computers have realtek chipset. When I connect to any website that request mic, it prompts me whether I want to allow it. There, I can select from 2 mic with the same name. Something like "Mic Realtec High Definition.." Which ever I select, the website doesnt get the sound from my mic. I also try to "allow" it from config:permissions but no luck. There was one way I was able to make it work. Here is how I did it. - Connect an audio cable and enable "line-in" in computer - Website A - set mic to "allow" in permissions - Website B - do nothing 1) Access website B 2) When prompted for a mic from B, select line-in 3) B will not pick up any sound yet (whether or not I have sound coming into line-in doesnt make any difference) 4) Access website A 5) Now, both website will pick up sound from my mic This still works if I switch A and B. It seems to me that Firefox is having trouble choosing which device it should listen to. I would appreciate it if someone can figure out the problem as it is inconvenient if I have to do this all the time.