Firefox cannot properly access the microphone; it flickers in the system tray and shows that Firefox is rapidly using and then not using the microphone. When I mute the microphone in-app, the flicker stops, and the microphone icon is steady. People cannot hear me speak. I've done all basic troubleshooting, restarted my computer and Firefox, restored all computer settings, done a Firefox reset, and so forth. The microphone works fine elsewhere, including on the same app in Chrome.