Added more references to tickets and problems with firefox.

static/js/mediastream/peerconnection.js

@@ -72,10 +72,16 @@ define(['jquery', 'underscore', 'webrtc.adapter'], function($, _) {
 			// for example https://bugzilla.mozilla.org/show_bug.cgi?id=998546.
 			pc.onaddstream = _.bind(this.onRemoteStreamAdded, this);
 			pc.onremovestream = _.bind(this.onRemoteStreamRemoved, this);
+			// NOTE(longsleep): Firefox 38 has support for onaddtrack. Unfortunately Chrome does
+			// not support this and thus both are not compatible. For the time being this means
+			// that renegotiation does not work between Firefox and Chrome. Even worse, current
+			// spec says that the event should really be named ontrack.
 			if (window.webrtcDetectedBrowser === "firefox") {
-				// NOTE(longsleep): onnegotiationneeded is not supported by Firefox. We trigger it
+				// NOTE(longsleep): onnegotiationneeded is not supported by Firefox < 38.
+				// Also firefox does not care about streams, but has the newer API for tracks
+				// implemented. This does not work together with Chrome, so we trigger negotiation
 				// manually when a stream is added or removed.
-				// https://bugzilla.mozilla.org/show_bug.cgi?id=840728
+				// https://bugzilla.mozilla.org/show_bug.cgi?id=1017888
 				this.negotiationNeeded = _.bind(function() {
 					if (this.currentcall.initiate) {
 						// Trigger onNegotiationNeeded once for Firefox.