The redesigned WebRTC UI in attachment 8485640 [details] has a way to change which window (and I assume application) is shared even after permission has already been granted (see images 3, 5 and 9). I don't think we currently have APIs to do this. Ideally in the future we would like to do this with microphones and cameras too, but it seems this should be easier to do for window/app share.
backlog: --- → webRTC+
Priority: -- → P4
Mass change P4->P5 to align with new Mozilla triage process.
Priority: P4 → P5
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