Tweedledee and Tweedledum
Chrome and Firefox can now “talk” to each other via WebRTC. WebRTC is a new set of technologies that brings clear crisp voice, sharp high-definition (HD) video and low-delay communication to the web browser.
According to the Chrome bog this means that developers can offer rich, secure communications, integrated directly into their web applications. Chrome and Firefox communicate by using standard technologies such as the Opus and VP8 codecs for audio and video, DTLS-SRTP for encryption, and ICE for networking.
You can test it out using 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. Google has come up with a launch video, check it out after the break.