I can't get it to work, hope this helps:

Firefox 32:

ICE failed, see about:webrtc for more details

Nightly 35a1:

Mandatory/optional in createOffer options is deprecated! Use {} instead (note the case difference)!

setLocalDescription called without success/failure callbacks. This is deprecated, and will be an error in the future.

ICE failed, see about:webrtc for more details

this._pc is null bundle.js:25705

Chrome 37:

Uncaught, unspecified "error" event. bundle.js:9134