I'm going to try to capture a crash report and send it to you.
I should note that it's not a "crash" -- it's just that I get immediately disconnected from the meeting when I have my video + audio on and then someone else joins. I'll try to get some repro steps and send to you!
If you send a link to [email protected] I can have a look, I'm on the media team at Mozilla (that includes WebRTC).
Thanks!