[Bug-gnuzilla] Audio/Video calls do not work (WebRTC issue?)

[Tirifto]

Hello all!

I have trouble getting audio/video calls to work in IceCat. They
work in neither Riot [1] nor Jitsi Meet [2]. It seems as though WebRTC
is not functioning properly. Does IceCat come with WebRTC disabled, and
if yes, is there a way to enable it?

I'm running Icecat 60.7.0 on Parabola GNU+Linux-libre, having installed
it via Arch User Repository [3]. (The installed binary should be the
one distributed by GNU.) In about:config, ‘media.peerconnection.enabled’
is set to ‘true’.

Best wishes and thanks in advance
// Tirifto

P.S.: I'm pretty sure I was able to make calls work earlier, when
running Icecat packaged by either Guix or Parabola. Does anyone know
whether those are set up or compiled differently?

P.P.S.: For the record, I do have custom add-ons installed, but I
couldn't get calls to work in safe mode, either, so that shouldn't be
the issue.

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1. https://about.riot.im/
2. https://meet.jit.si/
3. https://aur.archlinux.org/packages/icecat-bin/