--- a/dom/tests/mochitest/general/test_interfaces.html
+++ b/dom/tests/mochitest/general/test_interfaces.html
@@ -338,16 +338,18 @@ var interfaceNamesInGlobalScope =
     "DeviceMotionEvent",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "DeviceOrientationEvent",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "DeviceProximityEvent",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     { name: "DeviceStorageAreaChangedEvent", desktop: false},
 // IMPORTANT: Do not change this list without review from a DOM peer!
+    { name: "DeviceStorageAreaListener", desktop: false},
+// IMPORTANT: Do not change this list without review from a DOM peer!
     { name: "DeviceStorage", desktop: false},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     { name: "DeviceStorageChangeEvent", desktop: false},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "DisplayPortInputPort", b2g: true, permission: ["inputport"]},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "Document",
 // IMPORTANT: Do not change this list without review from a DOM peer!

new file mode 100644
--- /dev/null
+++ b/dom/webidl/DeviceStorageAreaListener.webidl
@@ -0,0 +1,10 @@
+/* -*- 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/. */
+
+[Pref="device.storage.enabled"]
+interface DeviceStorageAreaListener : EventTarget {
+  // Fired when a storage area is added or removed.
+  attribute EventHandler onstorageareachanged;
+};

--- a/dom/webidl/Navigator.webidl
+++ b/dom/webidl/Navigator.webidl
@@ -240,22 +240,29 @@ partial interface Navigator {
    * automatically when its associated window is unloaded.
    *
    * @param aTopic resource name
    */
   [Throws, Pref="dom.wakelock.enabled", Func="Navigator::HasWakeLockSupport", UnsafeInPrerendering]
   MozWakeLock requestWakeLock(DOMString aTopic);
 };
 
+partial interface Navigator {
+  [Throws, Pref="device.storage.enabled"]
+  readonly attribute DeviceStorageAreaListener deviceStorageAreaListener;
+};
+
 // nsIDOMNavigatorDeviceStorage
 partial interface Navigator {
   [Throws, Pref="device.storage.enabled"]
   DeviceStorage? getDeviceStorage(DOMString type);
   [Throws, Pref="device.storage.enabled"]
   sequence<DeviceStorage> getDeviceStorages(DOMString type);
+  [Throws, Pref="device.storage.enabled"]
+  DeviceStorage? getDeviceStorageByNameAndType(DOMString name, DOMString type);
 };
 
 // nsIDOMNavigatorDesktopNotification
 partial interface Navigator {
   [Throws, Pref="notification.feature.enabled", UnsafeInPrerendering]
   readonly attribute DesktopNotificationCenter mozNotification;
 };
 

--- a/dom/webidl/moz.build
+++ b/dom/webidl/moz.build
@@ -98,16 +98,17 @@ WEBIDL_FILES = [
     'DataStore.webidl',
     'DataStoreImpl.webidl',
     'DataTransfer.webidl',
     'DedicatedWorkerGlobalScope.webidl',
     'DelayNode.webidl',
     'DesktopNotification.webidl',
     'DeviceMotionEvent.webidl',
     'DeviceStorage.webidl',
+    'DeviceStorageAreaListener.webidl',
     'Directory.webidl',
     'DisplayPortInputPort.webidl',
     'Document.webidl',
     'DocumentFragment.webidl',
     'DocumentTimeline.webidl',
     'DocumentType.webidl',
     'DOMCursor.webidl',
     'DOMError.webidl',