diff --git a/dom/browser-element/mochitest/browserElement_AudioChannel.js b/dom/browser-element/mochitest/browserElement_AudioChannel.js
index 61b292e96b55..f33dcb68ce1f 100644
--- a/dom/browser-element/mochitest/browserElement_AudioChannel.js
+++ b/dom/browser-element/mochitest/browserElement_AudioChannel.js
@@ -18,6 +18,12 @@ function noaudio() {
   iframe.src = 'http://example.org/tests/dom/browser-element/mochitest/file_empty.html';
 
   function noaudio_loadend() {
+    ok("mute" in iframe, "iframe.mute exists");
+    ok("unmute" in iframe, "iframe.unmute exists");
+    ok("getMuted" in iframe, "iframe.getMuted exists");
+    ok("getVolume" in iframe, "iframe.getVolume exists");
+    ok("setVolume" in iframe, "iframe.setVolume exists");
+
     ok("allowedAudioChannels" in iframe, "allowedAudioChannels exist");
     var channels = iframe.allowedAudioChannels;
     is(channels.length, 1, "1 audio channel by default");
@@ -40,6 +46,42 @@ function noaudio() {
       }
     })
 
+    .then(function() {
+      return new Promise(function(resolve) {
+        iframe.mute();
+        iframe.getMuted()
+          .then(result => is(result, true, "iframe.getMuted should be true."))
+          .then(resolve);
+      });
+    })
+
+    .then(function() {
+      return new Promise(function(resolve) {
+        iframe.unmute();
+        iframe.getMuted()
+          .then(result => is(result, false, "iframe.getMuted should be false."))
+          .then(resolve);
+      });
+    })
+
+    .then(function() {
+      return new Promise(function(resolve) {
+        iframe.setVolume(0);
+        iframe.getVolume()
+          .then(result => is(result, 0, "iframe.getVolume should be 0."))
+          .then(resolve);
+      });
+    })
+
+    .then(function() {
+      return new Promise(function(resolve) {
+        iframe.setVolume(1);
+        iframe.getVolume()
+          .then(result => is(result, 1, "iframe.getVolume should be 1."))
+          .then(resolve);
+      });
+    })
+
     .then(function() {
       return new Promise(function(r, rr) {
         ac.getMuted().onsuccess = function(e) {
@@ -109,6 +151,12 @@ function audio() {
   iframe.src = 'http://example.org/tests/dom/browser-element/mochitest/iframe_file_audio.html';
 
   function audio_loadend() {
+    ok("mute" in iframe, "iframe.mute exists");
+    ok("unmute" in iframe, "iframe.unmute exists");
+    ok("getMuted" in iframe, "iframe.getMuted exists");
+    ok("getVolume" in iframe, "iframe.getVolume exists");
+    ok("setVolume" in iframe, "iframe.setVolume exists");
+
     ok("allowedAudioChannels" in iframe, "allowedAudioChannels exist");
     var channels = iframe.allowedAudioChannels;
     is(channels.length, 1, "1 audio channel by default");