 <p>The bandwidth requirements are almost the same as the bandwidth requirement for <a href="https://en.wikipedia.org/wiki/Opus_%28audio_format%29">opus</a> and <a href="https://en.wikipedia.org/wiki/VP8">vp8</a>. Real time audio typically has a bitrate of 40-200kbit/s. Video requires at least 200 kbit/s (500kbit/s if you want to see people's faces).</p> <p>According to <a href="https://www.webrtc-experiment.com/webrtcpedia/">webrtc-experiment</a> the minimum bandwidth for opus is 6kbit/s and for vp8 100kbits/s. So in total that makes 106kbit/s but when you account for the overhead of the webrtc protocol stack and constantly varying network conditions I would guess that 200kbit/s is the minimum if one wants stable video and audio.</p> <p>Chrome and Firefox both use opus and vp8 so the bandwidth requirements should be the same. Although I don't have any hard data to prove it. </p> <p>You can see the current traffic generated by webrtc by going to chrome://webrtc-internals and inspecting all the charts.</p>