Having trouble sending WebRTC from Firefox+Linux

[vampirefrog]

Howdy, when using Firefox to use OvenSpace, it can start sending from one window, but if I open another window, including another browser (Brave), it can't start playing the video. If I send from Brave, it works fine in both windows.

This is what I see on the websocket in the second window, the one that's trying to play the video from the first window:

wss://space.ovenplayer.com:3333/ovenspace/ovenspace-5?transport=tcp

{"command":"request_offer"}
{"code":404,"error":"Cannot create offer"}

Window 1: (Firefox)

Window 2: (Brave)

[vampirefrog]

Looks like Firefox + windows and Brave + windows works fine too