Of course, with it being added generically, tons of websites immediately started using it..... nope. Ok, well, lets go back before that blog post... https://hacks.mozilla.org/2013/02/hello-chrome-its-firefox-c...
Ah ha, isn't that neat. WebRTC in Firefox and Chrome and a demo of it! Wait, still pretty much zero use in the wild of WebRTC...
This is why Google/Mozilla are adding features utilizing these new specs to the browser, because they're cool and no one else is. In the case of WebRTC, it's for a good reason, its a PITA to run TURN/STUN servers to ensure that people behind firewalls can establish a connection.