--- a/dom/media/test/crashtests/1028458.html
+++ b/dom/media/test/crashtests/1028458.html
@@ -6,17 +6,17 @@ navigator.mozGetUserMedia({audio: true, 
     var testAudio = document.getElementById('testAudio');
     // Wait some time for good measure
     var eventReceived = 0;
     testAudio.addEventListener("timeupdate", function() {
       if (++eventReceived == 3) {
         document.querySelector("html").className = "";
       }
     })
-    testAudio.mozSrcObject = stream;
+    testAudio.srcObject = stream;
     testAudio.play();
     }, function(err) {
       // Don't go orange if we can't get an audio input stream,
       // as this is not what we are trying to test and can happen on Windows.
       document.querySelector("html").className = "";
     });
 </script>
 

--- a/dom/media/test/test_mediatrack_events.html
+++ b/dom/media/test/test_mediatrack_events.html
@@ -101,17 +101,17 @@ function startTest() {
           element.onpause = onpause;
           element.pause();
         } else if (steps == 2) {
           stream.stop();
         }
       }
 
       var steps = 0;
-      element.mozSrcObject = stream;
+      element.srcObject = stream;
       element.onplaying = onplaying;
       element.onended = onended;
       element.play();
       steps++;
     },
     function(err) {
       ok(false, 'Unexpected error fired with: ' + err);
       SimpleTest.finish();

--- a/dom/media/test/test_streams_srcObject.html
+++ b/dom/media/test/test_streams_srcObject.html
@@ -44,19 +44,17 @@ var doTest = srcObject => new Promise(re
       resolve();
     }
     ++step;
   });
   a.play();
   b.play();
 });
 
-// TODO: remove prefixed version soon (1183495).
-
-var doTests = () => doTest("srcObject").then(() => doTest("mozSrcObject"))
+var doTests = () => doTest("srcObject")
   .catch(e => ok(false, "Unexpected error: " + e))
   .then(() => SimpleTest.finish())
   .catch(e => ok(false, "Coding error: " + e));
 
 </script>
 </pre>
 </body>
 </html>

--- a/dom/media/tests/mochitest/test_getUserMedia_audioCapture.html
+++ b/dom/media/tests/mochitest/test_getUserMedia_audioCapture.html
@@ -64,17 +64,17 @@ scriptsReady
     oscThroughMediaElement.frequency.value = 1000;
     var oscThroughAudioDestinationNode = ac.createOscillator();
     oscThroughAudioDestinationNode.frequency.value = 5000;
     var msDest = ac.createMediaStreamDestination();
 
     oscThroughMediaElement.connect(msDest);
     oscThroughAudioDestinationNode.connect(ac.destination);
 
-    acTone.mozSrcObject = msDest.stream;
+    acTone.srcObject = msDest.stream;
 
     getSineWaveFile(10000, 10, function(blob) {
       wavtone.src = URL.createObjectURL(blob);
       oscThroughMediaElement.start();
       oscThroughAudioDestinationNode.start();
       wavtone.loop = true;
       wavtone.play();
       acTone.play();

--- a/dom/media/tests/mochitest/test_peerConnection_callbacks.html
+++ b/dom/media/tests/mochitest/test_peerConnection_callbacks.html
@@ -48,39 +48,39 @@ pc2.onicecandidate = e => {
   pc1_stable
     .then(() => !e.candidate || pcall(pc1, pc1.addIceCandidate, e.candidate))
     .catch(generateErrorCallback());
 };
 
 var v1, v2;
 var delivered = new Promise(resolve => {
   pc2.onaddstream = e => {
-    v2.mozSrcObject = e.stream;
+    v2.srcObject = e.stream;
     resolve(e.stream);
   };
 });
 
 runNetworkTest(function() {
   v1 = createMediaElement('video', 'v1');
   v2 = createMediaElement('video', 'v2');
   var canPlayThrough = new Promise(resolve => v2.canplaythrough = resolve);
   is(v2.currentTime, 0, "v2.currentTime is zero at outset");
 
   // not testing legacy gUM here
   navigator.mediaDevices.getUserMedia({ video: true, audio: true })
-    .then(stream => pc1.addStream(v1.mozSrcObject = stream))
+    .then(stream => pc1.addStream(v1.srcObject = stream))
     .then(() => pcall(pc1, pc1.createOffer))
     .then(offer => pcall(pc1, pc1.setLocalDescription, offer))
     .then(() => pcall(pc2, pc2.setRemoteDescription, pc1.localDescription))
     .then(() => pcall(pc2, pc2.createAnswer))
     .then(answer => pcall(pc2, pc2.setLocalDescription, answer))
     .then(() => pcall(pc1, pc1.setRemoteDescription, pc2.localDescription))
     .then(() => delivered)
   //    .then(() => canPlayThrough)    // why doesn't this fire?
-    .then(() => waitUntil(() => v2.currentTime > 0 && v2.mozSrcObject.currentTime > 0))
+    .then(() => waitUntil(() => v2.currentTime > 0 && v2.srcObject.currentTime > 0))
     .then(() => ok(v2.currentTime > 0, "v2.currentTime is moving (" + v2.currentTime + ")"))
     .then(() => ok(true, "Connected."))
     .then(() => pcall(pc1, pc1.getStats, null))
     .then(stats => ok(Object.keys(stats).length > 0, "pc1 has stats"))
     .then(() => pcall(pc2, pc2.getStats, null))
     .then(stats => ok(Object.keys(stats).length > 0, "pc2 has stats"))
     .then(() => { v1.pause(); v2.pause(); })
     .catch(reason => ok(false, "unexpected failure: " + reason))

--- a/media/webrtc/trunk/webrtc/tools/loopback_test/adapter.js
+++ b/media/webrtc/trunk/webrtc/tools/loopback_test/adapter.js
@@ -105,23 +105,23 @@ if (navigator.mozGetUserMedia) {
       }
     }
     return iceServers;
   }
 
   // Attach a media stream to an element.
   attachMediaStream = function(element, stream) {
     console.log("Attaching media stream");
-    element.mozSrcObject = stream;
+    element.srcObject = stream;
     element.play();
   };
 
   reattachMediaStream = function(to, from) {
     console.log("Reattaching media stream");
-    to.mozSrcObject = from.mozSrcObject;
+    to.srcObject = from.srcObject;
     to.play();
   };
 
   // Fake get{Video,Audio}Tracks
   if (!MediaStream.prototype.getVideoTracks) {
     MediaStream.prototype.getVideoTracks = function() {
       return [];
     };
@@ -189,18 +189,16 @@ if (navigator.mozGetUserMedia) {
   // Code from Adam Barth.
   getUserMedia = navigator.webkitGetUserMedia.bind(navigator);
   navigator.getUserMedia = getUserMedia;
 
   // Attach a media stream to an element.
   attachMediaStream = function(element, stream) {
     if (typeof element.srcObject !== 'undefined') {
       element.srcObject = stream;
-    } else if (typeof element.mozSrcObject !== 'undefined') {
-      element.mozSrcObject = stream;
     } else if (typeof element.src !== 'undefined') {
       element.src = URL.createObjectURL(stream);
     } else {
       console.log('Error attaching stream to element.');
     }
   };
 
   reattachMediaStream = function(to, from) {

--- a/mobile/android/tests/browser/robocop/robocop_getusermedia2.html
+++ b/mobile/android/tests/browser/robocop/robocop_getusermedia2.html
@@ -27,55 +27,55 @@
       video: true,
       audio: true
     };
     startMedia(mediaConstraints);
   }
 
   function stopMedia() {
     if (video_status) {
-      video.mozSrcObject.stop();
-      video.mozSrcObject = null;
+      video.srcObject.stop();
+      video.srcObject = null;
       content.removeChild(video);
       capturing = false;
       video_status = false;
     }
     if (audio_status) {
-      audio.mozSrcObject.stop();
-      audio.mozSrcObject = null;
+      audio.srcObject.stop();
+      audio.srcObject = null;
       content.removeChild(audio);
       audio_status = false;
     }
   }
 
   function startMedia(param) {
     try {
       window.navigator.mozGetUserMedia(param, function(stream) {
         if (video_status) {
           content.appendChild(video);
-          video.mozSrcObject = stream;
+          video.srcObject = stream;
           video.play();
         }
         if (audio_status) {
           content.appendChild(audio);
-          audio.mozSrcObject = stream;
+          audio.srcObject = stream;
           audio.play();
         }
         var audioTracks = stream.getAudioTracks();
         var videoTracks = stream.getVideoTracks();
         document.title = "";
         if (audioTracks.length > 0) {
           document.title += "audio";
         }
         if (videoTracks.length > 0) {
           document.title += "video";
         }
         document.title += " gumtest";
-        audio.mozSrcObject.stop();
-        video.mozSrcObject.stop();
+        audio.srcObject.stop();
+        video.srcObject.stop();
       }, function(err) {
         document.title = "failed gumtest";
         stopMedia();
       });
     } catch (e) {
       stopMedia();
     }
   }