WebRTC screen sharing
Hi Neil, macOS requires the user to give the Firefox and Chrome apps “Screen Recording” permission first. NotFoundError means Firefox doesn’t have it. Normally, an OS prompt should have popped up here (see attachment) when you first pick a window in Firefox, but the OS may throttle those prompts, so it’s not shown always. Unfortunately, we don’t have a good way around that.
If you missed the prompt, you need to go to System Settings -> Privacy & Security -> Screen Recording, and turn it on for Firefox.
We do get these reports from time to time, so we’re not sure if the OS prompts appear as often as they should.
Hope that helps!
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