Hello
From Wikipedia: WebRTC (Web Real-Time Communication) is an API definition drafted by the World Wide Web Consortium (W3C) that supports browser-to-browser applications for voice calling, video chat, and P2P file sharing without plugins.
Now it found their way into Firefox. Sorry for images from Windows version, but Linux version of Aurora is too buggy for me.
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I hope this will become competitive solution for Skype and Facebook for avarage users.