I'm only going off some in-person dealing with folks behind WebRTC and they know that permissions suck and would hurt adoption and hence fight to make sure they don't happen.

They dismiss all privacy concerns with "you can't have privacy in a browser" and "fingerprinting will work anyways so we can't make it worse". It's head-in-sand approach to privacy and it's bad.

Even then, Firefox is simply wrong to tell people it'll use your proxy, then throw that out.