diff --git a/content/events/src/nsDOMNotifyAudioAvailableEvent.cpp b/content/events/src/nsDOMNotifyAudioAvailableEvent.cpp
index ac89205b5a5f..c7ecbc169208 100644
--- a/content/events/src/nsDOMNotifyAudioAvailableEvent.cpp
+++ b/content/events/src/nsDOMNotifyAudioAvailableEvent.cpp
@@ -10,7 +10,10 @@
 #include "nsContentUtils.h" // NS_DROP_JS_OBJECTS
 #include "jsfriendapi.h"
 
-nsDOMNotifyAudioAvailableEvent::nsDOMNotifyAudioAvailableEvent(mozilla::dom::EventTarget* aOwner,
+using namespace mozilla;
+using namespace mozilla::dom;
+
+nsDOMNotifyAudioAvailableEvent::nsDOMNotifyAudioAvailableEvent(EventTarget* aOwner,
                                                                nsPresContext* aPresContext,
                                                                nsEvent* aEvent,
                                                                uint32_t aEventType,
@@ -28,6 +31,7 @@ nsDOMNotifyAudioAvailableEvent::nsDOMNotifyAudioAvailableEvent(mozilla::dom::Eve
   if (mEvent) {
     mEvent->message = aEventType;
   }
+  SetIsDOMBinding();
 }
 
 DOMCI_DATA(NotifyAudioAvailableEvent, nsDOMNotifyAudioAvailableEvent)
@@ -93,7 +97,7 @@ nsDOMNotifyAudioAvailableEvent::GetFrameBuffer(JSContext* aCx, JS::Value* aResul
 NS_IMETHODIMP
 nsDOMNotifyAudioAvailableEvent::GetTime(float *aRetVal)
 {
-  *aRetVal = mTime;
+  *aRetVal = Time();
   return NS_OK;
 }
 
@@ -117,11 +121,42 @@ nsDOMNotifyAudioAvailableEvent::InitAudioAvailableEvent(const nsAString& aType,
   mFrameBufferLength = aFrameBufferLength;
   mTime = aTime;
   mAllowAudioData = aAllowAudioData;
+  mCachedArray = nullptr;
   return NS_OK;
 }
 
+void
+nsDOMNotifyAudioAvailableEvent::InitAudioAvailableEvent(const nsAString& aType,
+                                                        bool aCanBubble,
+                                                        bool aCancelable,
+                                                        const Nullable<Sequence<float> >& aFrameBuffer,
+                                                        uint32_t aFrameBufferLength,
+                                                        float aTime,
+                                                        bool aAllowAudioData,
+                                                        ErrorResult& aRv)
+{
+  if ((aFrameBuffer.IsNull() && aFrameBufferLength > 0) ||
+      (!aFrameBuffer.IsNull() &&
+       aFrameBuffer.Value().Length() < aFrameBufferLength)) {
+    aRv = NS_ERROR_UNEXPECTED;
+    return;
+  }
+
+  nsAutoArrayPtr<float> buffer;
+  if (!aFrameBuffer.IsNull()) {
+    buffer = new float[aFrameBufferLength];
+    memcpy(buffer.get(), aFrameBuffer.Value().Elements(),
+           aFrameBufferLength * sizeof(float));
+  }
+
+  aRv = InitAudioAvailableEvent(aType, aCanBubble, aCancelable,
+                                buffer.forget(),
+                                aFrameBufferLength,
+                                aTime, aAllowAudioData);
+}
+
 nsresult NS_NewDOMAudioAvailableEvent(nsIDOMEvent** aInstancePtrResult,
-                                      mozilla::dom::EventTarget* aOwner,
+                                      EventTarget* aOwner,
                                       nsPresContext* aPresContext,
                                       nsEvent *aEvent,
                                       uint32_t aEventType,
diff --git a/content/events/src/nsDOMNotifyAudioAvailableEvent.h b/content/events/src/nsDOMNotifyAudioAvailableEvent.h
index 0188498f1d80..763c002792ef 100644
--- a/content/events/src/nsDOMNotifyAudioAvailableEvent.h
+++ b/content/events/src/nsDOMNotifyAudioAvailableEvent.h
@@ -11,6 +11,7 @@
 #include "nsDOMEvent.h"
 #include "nsPresContext.h"
 #include "nsCycleCollectionParticipant.h"
+#include "mozilla/dom/NotifyAudioAvailableEventBinding.h"
 
 class nsDOMNotifyAudioAvailableEvent : public nsDOMEvent,
                                        public nsIDOMNotifyAudioAvailableEvent
@@ -39,6 +40,32 @@ public:
 
   ~nsDOMNotifyAudioAvailableEvent();
 
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aScope) MOZ_OVERRIDE
+  {
+    return mozilla::dom::NotifyAudioAvailableEventBinding::Wrap(aCx, aScope, this);
+  }
+
+  JSObject* GetFrameBuffer(JSContext* aCx, mozilla::ErrorResult& aRv)
+  {
+    JS::Value dummy;
+    aRv = GetFrameBuffer(aCx, &dummy);
+    return mCachedArray;
+  }
+
+  float Time()
+  {
+    return mTime;
+  }
+
+  void InitAudioAvailableEvent(const nsAString& aType,
+                               bool aCanBubble,
+                               bool aCancelable,
+                               const mozilla::dom::Nullable<mozilla::dom::Sequence<float> >& aFrameBuffer,
+                               uint32_t aFrameBufferLength,
+                               float aTime,
+                               bool aAllowAudioData,
+                               mozilla::ErrorResult& aRv);
 private:
   nsAutoArrayPtr<float> mFrameBuffer;
   uint32_t mFrameBufferLength;
diff --git a/content/events/test/Makefile.in b/content/events/test/Makefile.in
index 67584a5f97fd..16996a2dd964 100644
--- a/content/events/test/Makefile.in
+++ b/content/events/test/Makefile.in
@@ -102,6 +102,7 @@ MOCHITEST_FILES = \
 		test_bug812744.html \
 		test_addEventListenerExtraArg.html \
 		test_focus_disabled.html \
+		test_bug847597.html \
 		$(NULL)
 
 MOCHITEST_CHROME_FILES = \
diff --git a/content/events/test/test_bug847597.html b/content/events/test/test_bug847597.html
new file mode 100644
index 000000000000..5d1251ee1779
--- /dev/null
+++ b/content/events/test/test_bug847597.html
@@ -0,0 +1,81 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=847597
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 847597</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+
+  /** Test for Bug 847597 **/
+
+
+  var e = document.createEvent("mozaudioavailableevent");
+  e.initAudioAvailableEvent("foo", true, true, [1], 1, 123456, false);
+  is(e.type, "foo");
+  is(e.bubbles, true);
+  is(e.cancelable, true);
+  is(e.time, 123456);
+
+  try {
+    e.frameBuffer;
+    ok(false, "Should not be possible to access frameBuffer in unsafe context when the last parameter to init is false.");
+  } catch(ex) {
+    ok(true);
+  }
+
+  try {
+    e.initAudioAvailableEvent("foo", true, true, [1, 2, 3], 4, 123456, false);
+    ok(false, "Should have thrown an exception because too short array");
+  } catch(ex) {
+    ok(true);
+  }
+
+  try {
+    e.initAudioAvailableEvent("foo", true, true, [], 1, 123456, false);
+    ok(false, "Should have thrown an exception because too short array");
+  } catch(ex) {
+    ok(true);
+  }
+
+  try {
+    e.initAudioAvailableEvent("foo", true, true, null, 1, 123456, false);
+    ok(false, "Should have thrown an exception because too short array");
+  } catch(ex) {
+    ok(true);
+  }
+
+  e.initAudioAvailableEvent("foo", true, true, null, 0, 123456, false);
+  e.initAudioAvailableEvent("foo", true, true, [], 0, 123456, false);
+  e.initAudioAvailableEvent("foo", true, true, [1], 0, 123456, false);
+
+  e.initAudioAvailableEvent("foo", true, true, [0, 1, 2], 0, 123456, true);
+  is(e.frameBuffer.length, 0);
+  e.initAudioAvailableEvent("foo", true, true, [0, 1, 2], 1, 123456, true);
+  is(e.frameBuffer.length, 1);
+  is(e.frameBuffer[0], 0);
+  e.initAudioAvailableEvent("foo", true, true, [0, 1, 2], 2, 123456, true);
+  is(e.frameBuffer.length, 2);
+  is(e.frameBuffer[0], 0);
+  is(e.frameBuffer[1], 1);
+  e.initAudioAvailableEvent("foo", true, true, [0, 1, 2], 3, 123456, true);
+  is(e.frameBuffer.length, 3);
+  is(e.frameBuffer[0], 0);
+  is(e.frameBuffer[1], 1);
+  is(e.frameBuffer[2], 2);
+
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=847597">Mozilla Bug 847597</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/dom/bindings/Bindings.conf b/dom/bindings/Bindings.conf
index 1d86df7d280e..5c8df590bb9e 100644
--- a/dom/bindings/Bindings.conf
+++ b/dom/bindings/Bindings.conf
@@ -665,6 +665,10 @@ DOMInterfaces = {
     'nativeType': 'nsDOMNotifyPaintEvent',
 },
 
+'NotifyAudioAvailableEvent': {
+    'nativeType': 'nsDOMNotifyAudioAvailableEvent',
+},
+
 'PaintRequest': {
     'nativeType': 'nsPaintRequest',
 },
diff --git a/dom/webidl/NotifyAudioAvailableEvent.webidl b/dom/webidl/NotifyAudioAvailableEvent.webidl
new file mode 100644
index 000000000000..26672befecc6
--- /dev/null
+++ b/dom/webidl/NotifyAudioAvailableEvent.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface NotifyAudioAvailableEvent : Event
+{
+  [Throws]
+  readonly attribute Float32Array frameBuffer;
+
+  readonly attribute float  time;
+
+  [Throws]
+  void initAudioAvailableEvent(DOMString type,
+                               boolean canBubble,
+                               boolean cancelable,
+                               sequence<float>? frameBuffer,
+                               unsigned long frameBufferLength,
+                               float time,
+                               boolean allowAudioData);
+};
diff --git a/dom/webidl/WebIDL.mk b/dom/webidl/WebIDL.mk
index 3d8357f40fc9..3656299212c5 100644
--- a/dom/webidl/WebIDL.mk
+++ b/dom/webidl/WebIDL.mk
@@ -172,6 +172,7 @@ webidl_files = \
   NodeIterator.webidl \
   NodeList.webidl \
   Notification.webidl \
+  NotifyAudioAvailableEvent.webidl \
   NotifyPaintEvent.webidl \
   PaintRequest.webidl \
   PaintRequestList.webidl \
diff --git a/js/xpconnect/src/dom_quickstubs.qsconf b/js/xpconnect/src/dom_quickstubs.qsconf
index 817040abcb5b..ff564b544775 100644
--- a/js/xpconnect/src/dom_quickstubs.qsconf
+++ b/js/xpconnect/src/dom_quickstubs.qsconf
@@ -100,10 +100,6 @@ members = [
     'nsIBoxObject.width',
     'nsIBoxObject.height',
 
-    # Audio
-    'nsIDOMNotifyAudioAvailableEvent.frameBuffer',
-    'nsIDOMNotifyAudioAvailableEvent.time',
-
     # dom/indexedDB
     'nsIIDBCursor.*',
     'nsIIDBCursorWithValue.*',