Teams at Mozilla and Google have been working to integrate this new communication platform into their browsers and things are almost ready.
Here is a video call between Chrome and Firefox, using WebRTC.
To try this yourself, you’ll need desktop Chrome 25 Beta and Firefox Nightly for Desktop. In Firefox, you’ll need to go to about:config and set the media.peerconnection.enabled pref to “true”. Then head over to the WebRTC demo site and start calling.
For developers looking to include this functionality in their own apps, there are a few places you can go to get more information. You can look at the source code of the AppRTC demo, a library that makes writing cross-browser WebRTC apps a snap, and a document detailing some of the minor differences between browsers.
via Chromium Blog.