--- a/dom/browser-element/BrowserElementChildPreload.js
+++ b/dom/browser-element/BrowserElementChildPreload.js
@@ -287,21 +287,16 @@ BrowserElementChild.prototype = {
       "get-screenshot": this._recvGetScreenshot,
       "get-contentdimensions": this._recvGetContentDimensions,
       "set-visible": this._recvSetVisible,
       "get-visible": this._recvVisible,
       "send-mouse-event": this._recvSendMouseEvent,
       "send-touch-event": this._recvSendTouchEvent,
       "get-can-go-back": this._recvCanGoBack,
       "get-can-go-forward": this._recvCanGoForward,
-      "mute": this._recvMute,
-      "unmute": this._recvUnmute,
-      "get-muted": this._recvGetMuted,
-      "set-volume": this._recvSetVolume,
-      "get-volume": this._recvGetVolume,
       "go-back": this._recvGoBack,
       "go-forward": this._recvGoForward,
       "reload": this._recvReload,
       "stop": this._recvStop,
       "zoom": this._recvZoom,
       "unblock-modal-prompt": this._recvStopWaiting,
       "fire-ctx-callback": this._recvFireCtxCallback,
       "owner-visibility-change": this._recvOwnerVisibilityChange,
@@ -1305,42 +1300,16 @@ BrowserElementChild.prototype = {
   _recvCanGoForward: function(data) {
     var webNav = docShell.QueryInterface(Ci.nsIWebNavigation);
     sendAsyncMsg('got-can-go-forward', {
       id: data.json.id,
       successRv: webNav.canGoForward
     });
   },
 
-  _recvMute: function(data) {
-    this._windowUtils.audioMuted = true;
-  },
-
-  _recvUnmute: function(data) {
-    this._windowUtils.audioMuted = false;
-  },
-
-  _recvGetMuted: function(data) {
-    sendAsyncMsg('got-muted', {
-      id: data.json.id,
-      successRv: this._windowUtils.audioMuted
-    });
-  },
-
-  _recvSetVolume: function(data) {
-    this._windowUtils.audioVolume = data.json.volume;
-  },
-
-  _recvGetVolume: function(data) {
-    sendAsyncMsg('got-volume', {
-      id: data.json.id,
-      successRv: this._windowUtils.audioVolume
-    });
-  },
-
   _recvGoBack: function(data) {
     try {
       docShell.QueryInterface(Ci.nsIWebNavigation).goBack();
     } catch(e) {
       // Silently swallow errors; these happen when we can't go back.
     }
   },
 

--- a/dom/browser-element/BrowserElementParent.js
+++ b/dom/browser-element/BrowserElementParent.js
@@ -163,18 +163,16 @@ BrowserElementParent.prototype = {
       "firstpaint": this._fireProfiledEventFromMsg,
       "documentfirstpaint": this._fireProfiledEventFromMsg,
       "nextpaint": this._recvNextPaint,
       "got-purge-history": this._gotDOMRequestResult,
       "got-screenshot": this._gotDOMRequestResult,
       "got-contentdimensions": this._gotDOMRequestResult,
       "got-can-go-back": this._gotDOMRequestResult,
       "got-can-go-forward": this._gotDOMRequestResult,
-      "got-muted": this._gotDOMRequestResult,
-      "got-volume": this._gotDOMRequestResult,
       "requested-dom-fullscreen": this._requestedDOMFullscreen,
       "fullscreen-origin-change": this._fullscreenOriginChange,
       "exit-dom-fullscreen": this._exitDomFullscreen,
       "got-visible": this._gotDOMRequestResult,
       "visibilitychange": this._childVisibilityChange,
       "got-set-input-method-active": this._gotDOMRequestResult,
       "scrollviewchange": this._handleScrollViewChange,
       "caretstatechanged": this._handleCaretStateChanged,
@@ -619,32 +617,16 @@ BrowserElementParent.prototype = {
       backward: direction == Ci.nsIBrowserElementAPI.FIND_BACKWARD
     });
   }),
 
   clearMatch: defineNoReturnMethod(function() {
     return this._sendAsyncMsg('clear-match');
   }),
 
-  mute: defineNoReturnMethod(function() {
-    this._sendAsyncMsg('mute');
-  }),
-
-  unmute: defineNoReturnMethod(function() {
-    this._sendAsyncMsg('unmute');
-  }),
-
-  getMuted: defineDOMRequestMethod('get-muted'),
-
-  getVolume: defineDOMRequestMethod('get-volume'),
-
-  setVolume: defineNoReturnMethod(function(volume) {
-    this._sendAsyncMsg('set-volume', {volume});
-  }),
-
   goBack: defineNoReturnMethod(function() {
     this._sendAsyncMsg('go-back');
   }),
 
   goForward: defineNoReturnMethod(function() {
     this._sendAsyncMsg('go-forward');
   }),
 

--- a/dom/browser-element/nsIBrowserElementAPI.idl
+++ b/dom/browser-element/nsIBrowserElementAPI.idl
@@ -77,23 +77,16 @@ interface nsIBrowserElementAPI : nsISupp
   nsIDOMDOMRequest getCanGoBack();
   nsIDOMDOMRequest getCanGoForward();
   nsIDOMDOMRequest getContentDimensions();
 
   void findAll(in DOMString searchString, in long caseSensitivity);
   void findNext(in long direction);
   void clearMatch();
 
-  void mute();
-  void unmute();
-  nsIDOMDOMRequest getMuted();
-
-  void setVolume(in float volume);
-  nsIDOMDOMRequest getVolume();
-
   void addNextPaintListener(in nsIBrowserElementNextPaintListener listener);
   void removeNextPaintListener(in nsIBrowserElementNextPaintListener listener);
 
   nsIDOMDOMRequest executeScript(in DOMString script, in jsval options);
 
   /**
    * Returns an object that represents a Web Manifest:
    * http://w3c.github.io/manifest/

--- a/dom/html/nsBrowserElement.cpp
+++ b/dom/html/nsBrowserElement.cpp
@@ -450,84 +450,16 @@ nsBrowserElement::RemoveNextPaintListene
   nsresult rv = mBrowserElementAPI->RemoveNextPaintListener(listener);
 
   if (NS_WARN_IF(NS_FAILED(rv))) {
     aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
   }
 }
 
 already_AddRefed<DOMRequest>
-nsBrowserElement::GetMuted(ErrorResult& aRv)
-{
-  NS_ENSURE_TRUE(IsBrowserElementOrThrow(aRv), nullptr);
-
-  nsCOMPtr<nsIDOMDOMRequest> req;
-  nsresult rv = mBrowserElementAPI->GetMuted(getter_AddRefs(req));
-
-  if (NS_WARN_IF(NS_FAILED(rv))) {
-    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
-    return nullptr;
-  }
-
-  return req.forget().downcast<DOMRequest>();
-}
-
-void
-nsBrowserElement::Mute(ErrorResult& aRv)
-{
-  NS_ENSURE_TRUE_VOID(IsBrowserElementOrThrow(aRv));
-
-  nsresult rv = mBrowserElementAPI->Mute();
-
-  if (NS_WARN_IF(NS_FAILED(rv))) {
-    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
-  }
-}
-
-void
-nsBrowserElement::Unmute(ErrorResult& aRv)
-{
-  NS_ENSURE_TRUE_VOID(IsBrowserElementOrThrow(aRv));
-
-  nsresult rv = mBrowserElementAPI->Unmute();
-
-  if (NS_WARN_IF(NS_FAILED(rv))) {
-    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
-  }
-}
-
-already_AddRefed<DOMRequest>
-nsBrowserElement::GetVolume(ErrorResult& aRv)
-{
-  NS_ENSURE_TRUE(IsBrowserElementOrThrow(aRv), nullptr);
-
-  nsCOMPtr<nsIDOMDOMRequest> req;
-  nsresult rv = mBrowserElementAPI->GetVolume(getter_AddRefs(req));
-
-  if (NS_WARN_IF(NS_FAILED(rv))) {
-    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
-    return nullptr;
-  }
-
-  return req.forget().downcast<DOMRequest>();
-}
-
-void
-nsBrowserElement::SetVolume(float aVolume, ErrorResult& aRv)
-{
-  NS_ENSURE_TRUE_VOID(IsBrowserElementOrThrow(aRv));
-
-  nsresult rv = mBrowserElementAPI->SetVolume(aVolume);
-
-  if (NS_WARN_IF(NS_FAILED(rv))) {
-    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
-  }
-}
-
-already_AddRefed<DOMRequest>
 nsBrowserElement::ExecuteScript(const nsAString& aScript,
                                 const BrowserElementExecuteScriptOptions& aOptions,
                                 ErrorResult& aRv)
 {
   NS_ENSURE_TRUE(IsBrowserElementOrThrow(aRv), nullptr);
 
   nsCOMPtr<nsIDOMDOMRequest> req;
   nsCOMPtr<nsIXPConnectWrappedJS> wrappedObj = do_QueryInterface(mBrowserElementAPI);

--- a/dom/html/nsBrowserElement.h
+++ b/dom/html/nsBrowserElement.h
@@ -66,23 +66,16 @@ public:
 
   already_AddRefed<dom::DOMRequest>
   Download(const nsAString& aUrl,
            const dom::BrowserElementDownloadOptions& options,
            ErrorResult& aRv);
 
   already_AddRefed<dom::DOMRequest> PurgeHistory(ErrorResult& aRv);
 
-  void Mute(ErrorResult& aRv);
-  void Unmute(ErrorResult& aRv);
-  already_AddRefed<dom::DOMRequest> GetMuted(ErrorResult& aRv);
-
-  void SetVolume(float aVolume , ErrorResult& aRv);
-  already_AddRefed<dom::DOMRequest> GetVolume(ErrorResult& aRv);
-
   already_AddRefed<dom::DOMRequest>
   GetScreenshot(uint32_t aWidth,
                 uint32_t aHeight,
                 const nsAString& aMimeType,
                 ErrorResult& aRv);
 
   void Zoom(float aZoom, ErrorResult& aRv);
 

--- a/dom/webidl/BrowserElement.webidl
+++ b/dom/webidl/BrowserElement.webidl
@@ -166,51 +166,8 @@ interface BrowserElementPrivileged {
                            optional BrowserElementExecuteScriptOptions options);
 
   [Throws,
    Pref="dom.mozBrowserFramesEnabled",
    ChromeOnly]
   DOMRequest getWebManifest();
 
 };
-
-// Bits needed for BrowserElementAudioChannel.
-partial interface BrowserElementPrivileged {
-  /**
-   * Mutes all audio in this browser.
-   */
-  [Throws,
-   Pref="dom.mozBrowserFramesEnabled",
-   ChromeOnly]
-  void mute();
-
-  /**
-   * Unmutes all audio in this browser.
-   */
-  [Throws,
-   Pref="dom.mozBrowserFramesEnabled",
-   ChromeOnly]
-  void unmute();
-
-  /**
-   * Obtains whether or not the browser is muted.
-   */
-  [Throws,
-   Pref="dom.mozBrowserFramesEnabled",
-   ChromeOnly]
-  DOMRequest getMuted();
-
-  /**
-   * Sets the volume for the browser.
-   */
-  [Throws,
-   Pref="dom.mozBrowserFramesEnabled",
-   ChromeOnly]
-  void setVolume(float volume);
-
-  /**
-   * Gets the volume for the browser.
-   */
-  [Throws,
-   Pref="dom.mozBrowserFramesEnabled",
-   ChromeOnly]
-  DOMRequest getVolume();
-};