code: function AdapterJsRTCObjectFactory(logger) {
  
      Utils.checkArguments(arguments, 1);
  
      this.createIceServers = function (urls, username, password) {
          if (typeof(createIceServers) !== "undefined") {
              return createIceServers(urls, username, password);
          }
          else {
              logger.error("adapter.js not present or unsupported browser!");
              return null;
          }
      };
  
      this.createRTCSessionDescription = function (sessionDescriptionString) {
          if (typeof(RTCSessionDescription) !== "undefined") {
              return new RTCSessionDescription(sessionDescriptionString);
          }
          else {
              logger.error("adapter.js not present or unsupported browser!");
              return null;
          }
      };
  
      this.createRTCIceCandidate = function (rtcIceCandidateString) {
          if (typeof(RTCIceCandidate) !== "undefined") {
              return new RTCIceCandidate(rtcIceCandidateString);
          }
          else {
              logger.error("adapter.js not present or unsupported browser!");
              return null;
          }
      };
  
      this.createRTCPeerConnection = function (config) {
          if (typeof(RTCPeerConnection) !== "undefined") {
              return new RTCPeerConnection(config);
          }
          else {
              logger.error("adapter.js not present or unsupported browser!");
              return null;
          }
      };
  }
docs: An RTC Object factory that works in Firefox and Chrome when adapter.js is present
  
  adapter.js can be downloaded from:
  https://github.com/GoogleChrome/webrtc/blob/master/samples/web/js/adapter.js