Firefox Microphone Not Working
If you encounter that your external microphone is not working with Firefox, like your USB microphone, than do the follwoing:
Open a TAB and type
about:config
afther that search for
media.getusermedia.microphone.prefer_voice_stream_with_processing.enabled
Change the value from TRUE to
FALSE
That should solve your problem.
Enjoy,
Your ArtIT Team