According to Mozilla’s Wiki Firefox 22 with WebRTC support enabled by default will be released on week of June 24. WebRTC is also available in the latest release of Google Chrome for Android, but it’s disabled by default (you can enable it in chrome://flags), we have a feeling that it will be enabled by default in the next release. Guys from Opera disabled all WebRTC-related code in their Opera Next first release, but they told us that it would be enabled as fast as possible (high priority). It appeared that June would be a month of a lot of new WebRTC releases and don’t forget about WebRTC Expo Conference that will take place in Atlanta.
P.S. WebRTC version of Zingaya click-to-call works in both Firefox 22 and Google Chrome for Android, so it will become fully functional right after the browsers are released.