diff -r 000000000000 -r 6474c204b198 dom/apps/src/StoreTrustAnchor.jsm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/apps/src/StoreTrustAnchor.jsm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,36 @@
+/* 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/. */
+
+"use strict";
+
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+
+this.EXPORTED_SYMBOLS = [
+  "TrustedRootCertificate"
+];
+
+const APP_TRUSTED_ROOTS= ["AppMarketplaceProdPublicRoot",
+                          "AppMarketplaceProdReviewersRoot",
+                          "AppMarketplaceDevPublicRoot",
+                          "AppMarketplaceDevReviewersRoot",
+                          "AppXPCShellRoot"];
+
+this.TrustedRootCertificate = {
+  _index: Ci.nsIX509CertDB.AppMarketplaceProdPublicRoot,
+  get index() {
+    return this._index;
+  },
+  set index(aIndex) {
+    // aIndex should be one of the
+    // Ci.nsIX509CertDB AppTrustedRoot defined values
+    let found = APP_TRUSTED_ROOTS.some((trustRoot) => {
+      return Ci.nsIX509CertDB[trustRoot] === aIndex;
+    });
+    if (found) {
+      this._index = aIndex;
+    }
+  }
+};
+