Mozilla is planning to provide a new feature that will allow free audio and video calls between its Firefox web browser, thereby ending the need of any third-party client service or plugin. Mozilla will soon release a new experimental version of Firefox Nightly, which will include an open source and Peer-to-peer communication protocol called WebRTC. The new experimental feature in Firefox is in collaboration with the TokBox, whose open source OpenTok video and voice software powers this new service, which does not require any add-on or plug-in.
Source: https://thehackernews.com/2014/06/mozilla-to-provide-webrtc-based-free.html