diff --git a/content/html/content/src/HTMLAudioElement.cpp b/content/html/content/src/HTMLAudioElement.cpp
index c5897c41543..52839396ca9 100644
--- a/content/html/content/src/HTMLAudioElement.cpp
+++ b/content/html/content/src/HTMLAudioElement.cpp
@@ -245,6 +245,12 @@ HTMLAudioElement::CanPlayChanged(int32_t canPlay)
   return NS_OK;
 }
 
+NS_IMETHODIMP
+HTMLAudioElement::WindowVolumeChanged()
+{
+  return HTMLMediaElement::WindowVolumeChanged();
+}
+
 NS_IMETHODIMP
 HTMLAudioElement::Notify(nsITimer* aTimer)
 {
diff --git a/content/html/content/src/HTMLMediaElement.cpp b/content/html/content/src/HTMLMediaElement.cpp
index c5cc64da193..05117b7377e 100644
--- a/content/html/content/src/HTMLMediaElement.cpp
+++ b/content/html/content/src/HTMLMediaElement.cpp
@@ -1729,6 +1729,14 @@ void HTMLMediaElement::SetVolumeInternal()
   float effectiveVolume = mMuted ? 0.0f :
     mAudioChannelFaded ? float(mVolume) * FADED_VOLUME_RATIO : float(mVolume);
 
+  if (mAudioChannelAgent) {
+    float volume;
+    nsresult rv = mAudioChannelAgent->GetWindowVolume(&volume);
+    if (NS_SUCCEEDED(rv)) {
+      effectiveVolume *= volume;
+    }
+  }
+
   if (mDecoder) {
     mDecoder->SetVolume(effectiveVolume);
   } else if (mAudioStream) {
@@ -3921,6 +3929,12 @@ NS_IMETHODIMP HTMLMediaElement::CanPlayChanged(int32_t canPlay)
   return NS_OK;
 }
 
+NS_IMETHODIMP HTMLMediaElement::WindowVolumeChanged()
+{
+  SetVolumeInternal();
+  return NS_OK;
+}
+
 /* readonly attribute TextTrackList textTracks; */
 TextTrackList*
 HTMLMediaElement::TextTracks() const
diff --git a/content/media/webaudio/AudioContext.cpp b/content/media/webaudio/AudioContext.cpp
index 5e2b05c9060..6e1643cbdab 100644
--- a/content/media/webaudio/AudioContext.cpp
+++ b/content/media/webaudio/AudioContext.cpp
@@ -64,8 +64,6 @@ NS_IMPL_RELEASE_INHERITED(AudioContext, nsDOMEventTargetHelper)
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(AudioContext)
 NS_INTERFACE_MAP_END_INHERITING(nsDOMEventTargetHelper)
 
-static uint8_t gWebAudioOutputKey;
-
 static float GetSampleRateForAudioContext(bool aIsOffline, float aSampleRate)
 {
   if (aIsOffline) {
@@ -95,7 +93,6 @@ AudioContext::AudioContext(nsPIDOMWindow* aWindow,
   // bound to the window.
   mDestination = new AudioDestinationNode(this, aIsOffline, aNumberOfChannels,
                                           aLength, aSampleRate);
-  mDestination->Stream()->AddAudioOutput(&gWebAudioOutputKey);
   // We skip calling SetIsOnlyNodeForContext during mDestination's constructor,
   // because we can only call SetIsOnlyNodeForContext after mDestination has
   // been set up.
diff --git a/content/media/webaudio/AudioDestinationNode.cpp b/content/media/webaudio/AudioDestinationNode.cpp
index 5884ed1f5a4..3f685db9380 100644
--- a/content/media/webaudio/AudioDestinationNode.cpp
+++ b/content/media/webaudio/AudioDestinationNode.cpp
@@ -23,6 +23,8 @@
 namespace mozilla {
 namespace dom {
 
+static uint8_t gWebAudioOutputKey;
+
 class OfflineDestinationNodeEngine : public AudioNodeEngine
 {
 public:
@@ -233,6 +235,7 @@ AudioDestinationNode::AudioDestinationNode(AudioContext* aContext,
 
   mStream = graph->CreateAudioNodeStream(engine, MediaStreamGraph::EXTERNAL_STREAM);
   mStream->AddMainThreadListener(this);
+  mStream->AddAudioOutput(&gWebAudioOutputKey);
 
   if (!aIsOffline && UseAudioChannelService()) {
     nsCOMPtr<nsIDOMEventTarget> target = do_QueryInterface(GetOwner());
@@ -380,6 +383,23 @@ AudioDestinationNode::CanPlayChanged(int32_t aCanPlay)
   return NS_OK;
 }
 
+NS_IMETHODIMP
+AudioDestinationNode::WindowVolumeChanged()
+{
+  MOZ_ASSERT(mAudioChannelAgent);
+
+  if (!mStream) {
+    return NS_OK;
+  }
+
+  float volume;
+  nsresult rv = mAudioChannelAgent->GetWindowVolume(&volume);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  mStream->SetAudioOutputVolume(&gWebAudioOutputKey, volume);
+  return NS_OK;
+}
+
 AudioChannel
 AudioDestinationNode::MozAudioChannelType() const
 {
diff --git a/content/media/webaudio/AudioDestinationNode.h b/content/media/webaudio/AudioDestinationNode.h
index 3b78eec53d3..6299cdf56ad 100644
--- a/content/media/webaudio/AudioDestinationNode.h
+++ b/content/media/webaudio/AudioDestinationNode.h
@@ -38,6 +38,7 @@ public:
 
   NS_DECL_ISUPPORTS_INHERITED
   NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(AudioDestinationNode, AudioNode)
+  NS_DECL_NSIAUDIOCHANNELAGENTCALLBACK
 
   virtual JSObject* WrapObject(JSContext* aCx,
                                JS::Handle<JSObject*> aScope) MOZ_OVERRIDE;
@@ -61,9 +62,6 @@ public:
   // nsIDOMEventListener
   NS_IMETHOD HandleEvent(nsIDOMEvent* aEvent);
 
-  // nsIAudioChannelAgentCallback
-  NS_IMETHOD CanPlayChanged(int32_t aCanPlay);
-
   AudioChannel MozAudioChannelType() const;
   void SetMozAudioChannelType(AudioChannel aValue, ErrorResult& aRv);
 
diff --git a/dom/audiochannel/AudioChannelAgent.cpp b/dom/audiochannel/AudioChannelAgent.cpp
index 840e106825e..af8f8a306fd 100644
--- a/dom/audiochannel/AudioChannelAgent.cpp
+++ b/dom/audiochannel/AudioChannelAgent.cpp
@@ -6,6 +6,7 @@
 #include "AudioChannelCommon.h"
 #include "AudioChannelService.h"
 #include "nsIDOMWindow.h"
+#include "nsPIDOMWindow.h"
 #include "nsXULAppAPI.h"
 
 using namespace mozilla::dom;
@@ -183,3 +184,29 @@ AudioChannelAgent::GetCallback()
   }
   return callback.forget();
 }
+
+void
+AudioChannelAgent::WindowVolumeChanged()
+{
+  nsCOMPtr<nsIAudioChannelAgentCallback> callback = GetCallback();
+  if (!callback) {
+    return;
+  }
+
+  callback->WindowVolumeChanged();
+}
+
+NS_IMETHODIMP
+AudioChannelAgent::GetWindowVolume(float* aVolume)
+{
+  NS_ENSURE_ARG_POINTER(aVolume);
+
+  nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(mWindow);
+  if (!win) {
+    *aVolume = 1.0f;
+    return NS_OK;
+  }
+
+  *aVolume = win->GetAudioGlobalVolume();
+  return NS_OK;
+}
diff --git a/dom/audiochannel/AudioChannelAgent.h b/dom/audiochannel/AudioChannelAgent.h
index c4ed413b069..efb67843003 100644
--- a/dom/audiochannel/AudioChannelAgent.h
+++ b/dom/audiochannel/AudioChannelAgent.h
@@ -34,6 +34,13 @@ public:
   AudioChannelAgent();
   virtual void NotifyAudioChannelStateChanged();
 
+  void WindowVolumeChanged();
+
+  nsIDOMWindow* Window() const
+  {
+    return mWindow;
+  }
+
 private:
   virtual ~AudioChannelAgent();
 
diff --git a/dom/audiochannel/AudioChannelService.cpp b/dom/audiochannel/AudioChannelService.cpp
index 42d6ea0dbf3..78d42803d21 100644
--- a/dom/audiochannel/AudioChannelService.cpp
+++ b/dom/audiochannel/AudioChannelService.cpp
@@ -780,3 +780,44 @@ AudioChannelService::GetInternalType(AudioChannelType aType,
 
   MOZ_CRASH("unexpected audio channel type");
 }
+
+struct RefreshAgentsVolumeData
+{
+  RefreshAgentsVolumeData(nsPIDOMWindow* aWindow)
+    : mWindow(aWindow)
+  {}
+
+  nsPIDOMWindow* mWindow;
+  nsTArray<nsRefPtr<AudioChannelAgent>> mAgents;
+};
+
+PLDHashOperator
+AudioChannelService::RefreshAgentsVolumeEnumerator(AudioChannelAgent* aAgent,
+                                                   AudioChannelAgentData* aUnused,
+                                                   void* aPtr)
+{
+  MOZ_ASSERT(aAgent);
+  RefreshAgentsVolumeData* data = static_cast<RefreshAgentsVolumeData*>(aPtr);
+  MOZ_ASSERT(data);
+
+  nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aAgent->Window());
+  if (window && !window->IsInnerWindow()) {
+    window = window->GetCurrentInnerWindow();
+  }
+
+  if (window == data->mWindow) {
+    data->mAgents.AppendElement(aAgent);
+  }
+
+  return PL_DHASH_NEXT;
+}
+void
+AudioChannelService::RefreshAgentsVolume(nsPIDOMWindow* aWindow)
+{
+  RefreshAgentsVolumeData data(aWindow);
+  mAgents.EnumerateRead(RefreshAgentsVolumeEnumerator, &data);
+
+  for (uint32_t i = 0; i < data.mAgents.Length(); ++i) {
+    data.mAgents[i]->WindowVolumeChanged();
+  }
+}
diff --git a/dom/audiochannel/AudioChannelService.h b/dom/audiochannel/AudioChannelService.h
index fdd97099d86..7aa7d98003e 100644
--- a/dom/audiochannel/AudioChannelService.h
+++ b/dom/audiochannel/AudioChannelService.h
@@ -16,6 +16,8 @@
 #include "AudioChannelAgent.h"
 #include "nsClassHashtable.h"
 
+class nsPIDOMWindow;
+
 namespace mozilla {
 namespace dom {
 #ifdef MOZ_WIDGET_GONK
@@ -85,6 +87,8 @@ public:
 
   bool AnyAudioChannelIsActive();
 
+  void RefreshAgentsVolume(nsPIDOMWindow* aWindow);
+
 #ifdef MOZ_WIDGET_GONK
   void RegisterSpeakerManager(SpeakerManagerService* aSpeakerManager)
   {
@@ -179,6 +183,11 @@ protected:
   NotifyEnumerator(AudioChannelAgent* aAgent,
                    AudioChannelAgentData* aData, void *aUnused);
 
+  static PLDHashOperator
+  RefreshAgentsVolumeEnumerator(AudioChannelAgent* aAgent,
+                                AudioChannelAgentData* aUnused,
+                                void *aPtr);
+
   nsClassHashtable< nsPtrHashKey<AudioChannelAgent>, AudioChannelAgentData > mAgents;
 #ifdef MOZ_WIDGET_GONK
   nsTArray<SpeakerManagerService*>  mSpeakerManager;
diff --git a/dom/audiochannel/nsIAudioChannelAgent.idl b/dom/audiochannel/nsIAudioChannelAgent.idl
index ad7603029a1..ef146cb5ec0 100644
--- a/dom/audiochannel/nsIAudioChannelAgent.idl
+++ b/dom/audiochannel/nsIAudioChannelAgent.idl
@@ -6,7 +6,7 @@
 
 interface nsIDOMWindow;
 
-[function, scriptable, uuid(86975108-cd78-4796-8fc8-6cd777cd6eba)]
+[scriptable, uuid(194b55d9-39c0-45c6-b8ef-b8049f978ea5)]
 interface nsIAudioChannelAgentCallback : nsISupports
 {
   /**
@@ -19,6 +19,11 @@ interface nsIAudioChannelAgentCallback : nsISupports
    *        it is faded state then the volume of media should be reduced.
    */
   void canPlayChanged(in long canPlay);
+
+  /**
+   * Notified when the window volume/mute is changed
+   */
+  void windowVolumeChanged();
 };
 
 /**
@@ -35,7 +40,7 @@ interface nsIAudioChannelAgentCallback : nsISupports
  *   1. Changes to the playable status of this channel.
  */
 
-[scriptable, uuid(86ef883d-9cec-4c04-994f-5de198286e7c)]
+[scriptable, uuid(2b0222a5-8f7b-49d2-9ab8-cd01b744b23e)]
 interface nsIAudioChannelAgent : nsISupports
 {
   const long AUDIO_AGENT_CHANNEL_NORMAL             = 0;
@@ -128,5 +133,10 @@ interface nsIAudioChannelAgent : nsISupports
    *    True if the window associated with the agent is visible.
    */
   void setVisibilityState(in boolean visible);
+
+  /**
+   * Retrieve the volume from the window.
+   */
+  readonly attribute float windowVolume;
 };
 
diff --git a/dom/audiochannel/tests/TestAudioChannelService.cpp b/dom/audiochannel/tests/TestAudioChannelService.cpp
index c645c19c2a0..17ad5d81f2e 100644
--- a/dom/audiochannel/tests/TestAudioChannelService.cpp
+++ b/dom/audiochannel/tests/TestAudioChannelService.cpp
@@ -104,6 +104,11 @@ public:
     return NS_OK;
   }
 
+  NS_IMETHODIMP WindowVolumeChanged()
+  {
+    return NS_OK;
+  }
+
   nsresult GetCanPlay(AudioChannelState *_ret)
   {
     int loop = 0;
diff --git a/dom/base/nsDOMWindowUtils.cpp b/dom/base/nsDOMWindowUtils.cpp
index b9ab0545a64..7579022cfcb 100644
--- a/dom/base/nsDOMWindowUtils.cpp
+++ b/dom/base/nsDOMWindowUtils.cpp
@@ -3732,3 +3732,53 @@ nsDOMWindowUtils::GetOMTAOrComputedStyle(nsIDOMElement* aElement,
   return style->GetPropertyValue(aProperty, aResult);
 }
 
+NS_IMETHODIMP
+nsDOMWindowUtils::GetAudioMuted(bool* aMuted)
+{
+  if (!nsContentUtils::IsCallerChrome()) {
+    return NS_ERROR_DOM_SECURITY_ERR;
+  }
+  nsCOMPtr<nsPIDOMWindow> window = do_QueryReferent(mWindow);
+  NS_ENSURE_STATE(window);
+
+  *aMuted = window->GetAudioMuted();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDOMWindowUtils::SetAudioMuted(bool aMuted)
+{
+  if (!nsContentUtils::IsCallerChrome()) {
+    return NS_ERROR_DOM_SECURITY_ERR;
+  }
+  nsCOMPtr<nsPIDOMWindow> window = do_QueryReferent(mWindow);
+  NS_ENSURE_STATE(window);
+
+  window->SetAudioMuted(aMuted);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDOMWindowUtils::GetAudioVolume(float* aVolume)
+{
+  if (!nsContentUtils::IsCallerChrome()) {
+    return NS_ERROR_DOM_SECURITY_ERR;
+  }
+  nsCOMPtr<nsPIDOMWindow> window = do_QueryReferent(mWindow);
+  NS_ENSURE_STATE(window);
+
+  *aVolume = window->GetAudioVolume();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDOMWindowUtils::SetAudioVolume(float aVolume)
+{
+  if (!nsContentUtils::IsCallerChrome()) {
+    return NS_ERROR_DOM_SECURITY_ERR;
+  }
+  nsCOMPtr<nsPIDOMWindow> window = do_QueryReferent(mWindow);
+  NS_ENSURE_STATE(window);
+
+  return window->SetAudioVolume(aVolume);
+}
diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index 39a802174c0..92d362e7805 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -60,6 +60,7 @@
 #include "mozilla/Attributes.h"
 #include "mozilla/Debug.h"
 #include "mozilla/MouseEvents.h"
+#include "AudioChannelService.h"
 
 // Interfaces Needed
 #include "nsIFrame.h"
@@ -564,6 +565,7 @@ nsPIDOMWindow::nsPIDOMWindow(nsPIDOMWindow *aOuterWindow)
   mMayHavePointerEnterLeaveEventListener(false),
   mIsModalContentWindow(false),
   mIsActive(false), mIsBackground(false),
+  mAudioMuted(false), mAudioVolume(1.0),
   mInnerWindow(nullptr), mOuterWindow(aOuterWindow),
   // Make sure no actual window ends up with mWindowID == 0
   mWindowID(++gNextWindowID), mHasNotifiedGlobalCreated(false),
@@ -3582,6 +3584,100 @@ nsPIDOMWindow::CreatePerformanceObjectIfNeeded()
   }
 }
 
+bool
+nsPIDOMWindow::GetAudioMuted() const
+{
+  if (!IsInnerWindow()) {
+    return mInnerWindow->GetAudioMuted();
+  }
+
+  return mAudioMuted;
+}
+
+void
+nsPIDOMWindow::SetAudioMuted(bool aMuted)
+{
+  if (!IsInnerWindow()) {
+    mInnerWindow->SetAudioMuted(aMuted);
+    return;
+  }
+
+  if (mAudioMuted == aMuted) {
+    return;
+  }
+
+  mAudioMuted = aMuted;
+  RefreshMediaElements();
+}
+
+float
+nsPIDOMWindow::GetAudioVolume() const
+{
+  if (!IsInnerWindow()) {
+    return mInnerWindow->GetAudioVolume();
+  }
+
+  return mAudioVolume;
+}
+
+nsresult
+nsPIDOMWindow::SetAudioVolume(float aVolume)
+{
+  if (!IsInnerWindow()) {
+    return mInnerWindow->SetAudioVolume(aVolume);
+  }
+
+  if (aVolume < 0.0) {
+    return NS_ERROR_DOM_INDEX_SIZE_ERR;
+  }
+
+  if (mAudioVolume == aVolume) {
+    return NS_OK;
+  }
+
+  mAudioVolume = aVolume;
+  RefreshMediaElements();
+  return NS_OK;
+}
+
+float
+nsPIDOMWindow::GetAudioGlobalVolume()
+{
+  float globalVolume = 1.0;
+  nsCOMPtr<nsPIDOMWindow> window = this;
+
+  do {
+    if (window->GetAudioMuted()) {
+      return 0;
+    }
+
+    globalVolume *= window->GetAudioVolume();
+
+    nsCOMPtr<nsIDOMWindow> win;
+    window->GetParent(getter_AddRefs(win));
+    if (window == win) {
+      break;
+    }
+
+    window = do_QueryInterface(win);
+
+    // If there is not parent, or we are the toplevel or the volume is
+    // already 0.0, we don't continue.
+  } while (window && window != this && globalVolume);
+
+  return globalVolume;
+}
+
+void
+nsPIDOMWindow::RefreshMediaElements()
+{
+  nsRefPtr<AudioChannelService> service =
+    AudioChannelService::GetAudioChannelService();
+  if (service) {
+    service->RefreshAgentsVolume(this);
+  }
+}
+
 // nsISpeechSynthesisGetter
 
 #ifdef MOZ_WEBSPEECH
diff --git a/dom/base/nsPIDOMWindow.h b/dom/base/nsPIDOMWindow.h
index 1a0e7d26740..b9b30f5b23c 100644
--- a/dom/base/nsPIDOMWindow.h
+++ b/dom/base/nsPIDOMWindow.h
@@ -190,11 +190,23 @@ public:
 
   virtual NS_HIDDEN_(bool) IsRunningTimeout() = 0;
 
+  // Audio API
+  bool GetAudioMuted() const;
+  void SetAudioMuted(bool aMuted);
+
+  float GetAudioVolume() const;
+  nsresult SetAudioVolume(float aVolume);
+
+  float GetAudioGlobalVolume();
+
 protected:
   // Lazily instantiate an about:blank document if necessary, and if
   // we have what it takes to do so.
   void MaybeCreateDoc();
 
+  float GetAudioGlobalVolumeInternal(float aVolume);
+  void RefreshMediaElements();
+
 public:
   // Internal getter/setter for the frame element, this version of the
   // getter crosses chrome boundaries whereas the public scriptable
@@ -768,6 +780,9 @@ protected:
   // "active".  Only used on outer windows.
   bool                   mIsBackground;
 
+  bool                   mAudioMuted;
+  float                  mAudioVolume;
+
   // And these are the references between inner and outer windows.
   nsPIDOMWindow         *mInnerWindow;
   nsCOMPtr<nsPIDOMWindow> mOuterWindow;
diff --git a/dom/base/test/mochitest.ini b/dom/base/test/mochitest.ini
index 54ee069419e..f5613e88a14 100644
--- a/dom/base/test/mochitest.ini
+++ b/dom/base/test/mochitest.ini
@@ -8,6 +8,7 @@ support-files =
 
 [test_Image_constructor.html]
 [test_appname_override.html]
+[test_audioWindowUtils.html]
 [test_bug913761.html]
 [test_bug978522.html]
 [test_bug979109.html]
diff --git a/dom/base/test/test_audioWindowUtils.html b/dom/base/test/test_audioWindowUtils.html
new file mode 100644
index 00000000000..4018ce6aef4
--- /dev/null
+++ b/dom/base/test/test_audioWindowUtils.html
@@ -0,0 +1,92 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for audio controller in windows</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<iframe src="about:blank" id="iframe"></iframe>
+<script type="application/javascript">
+
+function runTest() {
+  var utils = SpecialPowers.wrap(window).
+        QueryInterface(SpecialPowers.Ci.nsIInterfaceRequestor).
+        getInterface(SpecialPowers.Ci.nsIDOMWindowUtils);
+  ok(utils, "nsIDOMWindowUtils");
+
+  is(utils.audioMuted, false, "By default utils.audioMuted is false");
+  utils.audioMuted = true;
+  is(utils.audioMuted, true, "utils.audioMuted is true");
+  utils.audioMuted = false;
+  is(utils.audioMuted, false, "utils.audioMuted is true");
+
+  is(utils.audioVolume, 1.0, "By default utils.audioVolume is 1.0");
+  utils.audioVolume = 0.4;
+  is(utils.audioVolume.toFixed(2), 0.4, "utils.audioVolume is ok");
+  utils.audioMuted = true;
+  is(utils.audioMuted, true, "utils.audioMuted is true");
+  is(utils.audioVolume.toFixed(2), 0.4, "utils.audioVolume is ok");
+  utils.audioMuted = false;
+
+  utils.audioVolume = 2.0;
+  is(utils.audioVolume, 2.0, "utils.audioVolume is ok");
+
+  try {
+    utils.audioVolume = -42;
+    ok(false, "This should throw");
+  } catch(e) {
+    ok(true, "This should throw");
+  }
+
+  utils.audioVolume = 0;
+  is(utils.audioVolume, 0.0, "utils.audioVolume is ok");
+  utils.audioVolume = 1.0;
+  is(utils.audioVolume, 1.0, "utils.audioVolume is ok");
+
+  var iframe = document.getElementById("iframe");
+  ok(iframe, "IFrame exists");
+
+  utils = SpecialPowers.wrap(iframe.contentWindow).
+        QueryInterface(SpecialPowers.Ci.nsIInterfaceRequestor).
+        getInterface(SpecialPowers.Ci.nsIDOMWindowUtils);
+  ok(utils, "nsIDOMWindowUtils");
+
+  is(utils.audioMuted, false, "By default utils.audioMuted is false");
+  utils.audioMuted = true;
+  is(utils.audioMuted, true, "utils.audioMuted is true");
+  utils.audioMuted = false;
+  is(utils.audioMuted, false, "utils.audioMuted is true");
+
+  is(utils.audioVolume, 1.0, "By default utils.audioVolume is 1.0");
+  utils.audioVolume = 0.4;
+  is(utils.audioVolume.toFixed(2), 0.4, "utils.audioVolume is ok");
+  utils.audioMuted = true;
+  is(utils.audioMuted, true, "utils.audioMuted is true");
+  is(utils.audioVolume.toFixed(2), 0.4, "utils.audioVolume is ok");
+  utils.audioMuted = false;
+
+  utils.audioVolume = 2.0;
+  is(utils.audioVolume, 2.0, "utils.audioVolume is ok");
+
+  try {
+    utils.audioVolume = -42;
+    ok(false, "This should throw");
+  } catch(e) {
+    ok(true, "This should throw");
+  }
+
+  utils.audioVolume = 0;
+  is(utils.audioVolume, 0.0, "utils.audioVolume is ok");
+  utils.audioVolume = 1.0;
+  is(utils.audioVolume, 1.0, "utils.audioVolume is ok");
+
+  SimpleTest.finish();
+}
+
+SpecialPowers.pushPrefEnv({ "set": [["media.useAudioChannelService", true]]}, runTest);
+SimpleTest.waitForExplicitFinish();
+
+</script>
+</body>
+</html>
diff --git a/dom/fmradio/FMRadio.cpp b/dom/fmradio/FMRadio.cpp
index b324f5cd924..8016e82661b 100644
--- a/dom/fmradio/FMRadio.cpp
+++ b/dom/fmradio/FMRadio.cpp
@@ -389,6 +389,12 @@ FMRadio::CanPlayChanged(int32_t aCanPlay)
   return NS_OK;
 }
 
+NS_IMETHODIMP
+FMRadio::WindowVolumeChanged(float aVolume)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
 void
 FMRadio::SetCanPlay(bool aCanPlay)
 {
diff --git a/dom/fmradio/FMRadio.h b/dom/fmradio/FMRadio.h
index 39b5a736f9f..64d51bbab27 100644
--- a/dom/fmradio/FMRadio.h
+++ b/dom/fmradio/FMRadio.h
@@ -34,6 +34,7 @@ public:
   FMRadio();
 
   NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIAUDIOCHANNELAGENTCALLBACK
 
   NS_REALLY_FORWARD_NSIDOMEVENTTARGET(nsDOMEventTargetHelper)
 
@@ -82,9 +83,6 @@ public:
   IMPL_EVENT_HANDLER(antennaavailablechange);
   IMPL_EVENT_HANDLER(frequencychange);
 
-  // nsIAudioChannelAgentCallback
-  NS_IMETHOD CanPlayChanged(int32_t aCanPlay);
-
   // nsIDOMEventListener
   NS_IMETHOD HandleEvent(nsIDOMEvent* aEvent);
 
diff --git a/dom/interfaces/base/nsIDOMWindowUtils.idl b/dom/interfaces/base/nsIDOMWindowUtils.idl
index 061a9d2bc09..7fbb7b0f671 100644
--- a/dom/interfaces/base/nsIDOMWindowUtils.idl
+++ b/dom/interfaces/base/nsIDOMWindowUtils.idl
@@ -43,7 +43,7 @@ interface nsIDOMEventTarget;
 interface nsIRunnable;
 interface nsICompositionStringSynthesizer;
 
-[scriptable, uuid(27efada9-b8ea-4d70-a2e6-f46b9ba905f4)]
+[scriptable, uuid(ef70a299-033c-4adc-b214-6649aed9d828)]
 interface nsIDOMWindowUtils : nsISupports {
 
   /**
@@ -1582,4 +1582,17 @@ interface nsIDOMWindowUtils : nsISupports {
     */
    AString getOMTAOrComputedStyle(in nsIDOMElement aElement,
                                   in AString aProperty);
+
+   /**
+    * With this it's possible to mute all the MediaElements in this window.
+    * We have audioMuted and audioVolume to preserve the volume across
+    * mute/umute.
+    */
+   attribute boolean audioMuted;
+
+    /**
+     * range: greater or equal to 0. The real volume level is affected by the
+     * volume of all ancestor windows.
+     */
+    attribute float audioVolume;
 };