Fixes JS errors on FF. Fixes disco info JS error.

JitsiConference.js

     this.eventEmitter.emit(JitsiConferenceEvents.USER_JOINED, id);
     this.participants[id] = participant;
     this.connection.xmpp.connection.disco.info(
-        jid, "" /* node */, function(iq) {
-            participant._supportsDTMF = $(iq).find('>query>feature[var="urn:xmpp:jingle:dtmf:0"]').length > 0;
+        jid, "node", function(iq) {
+            participant._supportsDTMF = $(iq).find(
+                '>query>feature[var="urn:xmpp:jingle:dtmf:0"]').length > 0;
             this.updateDTMFSupport();
         }.bind(this)
     );

doc/example/example.js

 
 // JitsiMeetJS.setLogLevel(JitsiMeetJS.logLevels.ERROR);
 var initOptions = {
-    // disableAudioLevels: true,
+    disableAudioLevels: true,
     // Desktop sharing method. Can be set to 'ext', 'webrtc' or false to disable.
     desktopSharingChromeMethod: 'ext',
     // The ID of the jidesha extension for Chrome.
     desktopSharingFirefoxExtensionURL: null
 }
 JitsiMeetJS.init(initOptions).then(function(){
+    connection = new JitsiMeetJS.JitsiConnection(null, null, options);
+
+    connection.addEventListener(JitsiMeetJS.events.connection.CONNECTION_ESTABLISHED, onConnectionSuccess);
+    connection.addEventListener(JitsiMeetJS.events.connection.CONNECTION_FAILED, onConnectionFailed);
+    connection.addEventListener(JitsiMeetJS.events.connection.CONNECTION_DISCONNECTED, disconnect);
+
+    connection.connect();
     JitsiMeetJS.createLocalTracks({devices: ["audio", "video"]}).
         then(onLocalTracks).catch(function (error) {
             console.log(error);
 var room = null;
 var localTracks = [];
 var remoteTracks = {};
-
-
-connection = new JitsiMeetJS.JitsiConnection(null, null, options);
-
-connection.addEventListener(JitsiMeetJS.events.connection.CONNECTION_ESTABLISHED, onConnectionSuccess);
-connection.addEventListener(JitsiMeetJS.events.connection.CONNECTION_FAILED, onConnectionFailed);
-connection.addEventListener(JitsiMeetJS.events.connection.CONNECTION_DISCONNECTED, disconnect);
-
-connection.connect();

lib-jitsi-meet.js

     this.eventEmitter.emit(JitsiConferenceEvents.USER_JOINED, id);
     this.participants[id] = participant;
     this.connection.xmpp.connection.disco.info(
-        jid, "" /* node */, function(iq) {
-            participant._supportsDTMF = $(iq).find('>query>feature[var="urn:xmpp:jingle:dtmf:0"]').length > 0;
+        jid, "node", function(iq) {
+            participant._supportsDTMF = $(iq).find(
+                '>query>feature[var="urn:xmpp:jingle:dtmf:0"]').length > 0;
             this.updateDTMFSupport();
         }.bind(this)
     );
             }
         }
 
+        if (streams && streams.desktopStream)
+            desktopStream = streams.desktopStream;
+
     }
     else if (RTCBrowserType.isFirefox() || RTCBrowserType.isTemasysPluginUsed()) {   // Firefox and Temasys plugin
-        if (streams && streams.audioStream)
-            audioStream = streams.audioStream;
+        if (streams && streams.audio)
+            audioStream = streams.audio;
+
+        if (streams && streams.video)
+            videoStream = streams.video;
 
-        if (streams && streams.videoStream)
-            videoStream = streams.videoStream;
+        if(streams && streams.desktop)
+            desktopStream = streams.desktop;
     }
 
-    if (streams && streams.desktopStream)
-        res.push({stream: streams.desktopStream,
+    if (desktopStream)
+        res.push({stream: desktopStream,
             type: "video", videoType: "desktop"});
 
     if(audioStream)

modules/RTC/RTCUtils.js

             }
         }
 
+        if (streams && streams.desktopStream)
+            desktopStream = streams.desktopStream;
+
     }
     else if (RTCBrowserType.isFirefox() || RTCBrowserType.isTemasysPluginUsed()) {   // Firefox and Temasys plugin
-        if (streams && streams.audioStream)
-            audioStream = streams.audioStream;
+        if (streams && streams.audio)
+            audioStream = streams.audio;
+
+        if (streams && streams.video)
+            videoStream = streams.video;
 
-        if (streams && streams.videoStream)
-            videoStream = streams.videoStream;
+        if(streams && streams.desktop)
+            desktopStream = streams.desktop;
     }
 
-    if (streams && streams.desktopStream)
-        res.push({stream: streams.desktopStream,
+    if (desktopStream)
+        res.push({stream: desktopStream,
             type: "video", videoType: "desktop"});
 
     if(audioStream)