WebRTC not working in Firefox?

Question

Browsers

I get in the console:
ICE failed, see about: webrtc for more details
What could be the problem? here is the output of about:webrtc https://yadi.sk/i/XSPKT9xFjRhes

Answer 1

Solution:
{optional: [
{DtlsSrtpKeyAgreement: true} // FF <=> Chrome interop
]}