diff -r 000000000000 -r 6474c204b198 accessible/src/xul/XULAlertAccessible.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/accessible/src/xul/XULAlertAccessible.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,63 @@
+/* -*- Mode: C++; 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/. */
+
+#include "XULAlertAccessible.h"
+
+#include "Accessible-inl.h"
+#include "Role.h"
+#include "States.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULAlertAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULAlertAccessible::
+  XULAlertAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+}
+
+NS_IMPL_ISUPPORTS_INHERITED0(XULAlertAccessible, Accessible)
+
+role
+XULAlertAccessible::NativeRole()
+{
+  return roles::ALERT;
+}
+
+uint64_t
+XULAlertAccessible::NativeState()
+{
+  return Accessible::NativeState() | states::ALERT;
+}
+
+ENameValueFlag
+XULAlertAccessible::Name(nsString& aName)
+{
+  // Screen readers need to read contents of alert, not the accessible name.
+  // If we have both some screen readers will read the alert twice.
+  aName.Truncate();
+  return eNameOK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Widgets
+
+bool
+XULAlertAccessible::IsWidget() const
+{
+  return true;
+}
+
+Accessible*
+XULAlertAccessible::ContainerWidget() const
+{
+  // If a part of colorpicker widget.
+  if (mParent && mParent->IsMenuButton())
+    return mParent;
+  return nullptr;
+}