As far as I remember it uses WebRTC on Chrome, that's how it manages to be plugin free there. But there's subtle differences in browser implementations w.r.t We

As far as I remember it uses WebRTC on Chrome, that's how it manages to be plugin free there. But there's subtle differences in browser implementations w.r.t WebRTC, it's one of those... standards. WebRTC is also incredibly hard to debug from browsers.