rebase from FF 38 which has WebRTC This is a bit like saying "Firefox 4 has HTML5". The WebRTC stack in Firefox evolved significantly from Firefox 38 to 50, as

rebase from FF 38 which has WebRTC This is a bit like saying "Firefox 4 has HTML5". The WebRTC stack in Firefox evolved significantly from Firefox 38 to 50, as did the WebRTC standards themselves. That's why I pointed to interoperability issues.