diff --git a/toolkit/modules/UpdateUtils.jsm b/toolkit/modules/UpdateUtils.jsm
index 4e796a2da..4c6e7776d 100644
--- a/toolkit/modules/UpdateUtils.jsm
+++ b/toolkit/modules/UpdateUtils.jsm
@@ -2,6 +2,8 @@
  * 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/. */
 
+#filter substitution
+
 this.EXPORTED_SYMBOLS = ["UpdateUtils"];
 
 const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
@@ -65,23 +67,28 @@ this.UpdateUtils = {
    * @return The formatted URL.
    */
   formatUpdateURL(url) {
+    url = url.replace(/%ID%/g, Services.appinfo.ID);
     url = url.replace(/%PRODUCT%/g, Services.appinfo.name);
     url = url.replace(/%VERSION%/g, Services.appinfo.version);
     url = url.replace(/%BUILD_ID%/g, Services.appinfo.appBuildID);
     url = url.replace(/%BUILD_TARGET%/g, Services.appinfo.OS + "_" + this.ABI);
     url = url.replace(/%OS_VERSION%/g, this.OSVersion);
-    url = url.replace(/%SYSTEM_CAPABILITIES%/g, gSystemCapabilities);
+    url = url.replace(/%WIDGET_TOOLKIT%/g, "@MOZ_WIDGET_TOOLKIT@");
+    url = url.replace(/%CHANNEL%/g, this.UpdateChannel);
+
     if (/%LOCALE%/.test(url)) {
       url = url.replace(/%LOCALE%/g, this.Locale);
     }
-    url = url.replace(/%CHANNEL%/g, this.UpdateChannel);
+
+    url = url.replace(/%CUSTOM%/g, Preferences.get(PREF_APP_UPDATE_CUSTOM, ""));
+    url = url.replace(/\+/g, "%2B");
+
+    url = url.replace(/%SYSTEM_CAPABILITIES%/g, gSystemCapabilities);
     url = url.replace(/%PLATFORM_VERSION%/g, Services.appinfo.platformVersion);
     url = url.replace(/%DISTRIBUTION%/g,
                       getDistributionPrefValue(PREF_APP_DISTRIBUTION));
     url = url.replace(/%DISTRIBUTION_VERSION%/g,
                       getDistributionPrefValue(PREF_APP_DISTRIBUTION_VERSION));
-    url = url.replace(/%CUSTOM%/g, Preferences.get(PREF_APP_UPDATE_CUSTOM, ""));
-    url = url.replace(/\+/g, "%2B");
 
     return url;
   }
diff --git a/toolkit/modules/moz.build b/toolkit/modules/moz.build
index 708b77b9b..cdaa426b7 100644
--- a/toolkit/modules/moz.build
+++ b/toolkit/modules/moz.build
@@ -92,7 +92,6 @@ EXTRA_JS_MODULES += [
     'Sqlite.jsm',
     'Task.jsm',
     'Timer.jsm',
-    'UpdateUtils.jsm',
     'WebChannel.jsm',
     'WindowDraggingUtils.jsm',
     'ZipUtils.jsm',
@@ -103,6 +102,7 @@ EXTRA_JS_MODULES.sessionstore += ['sessionstore/Utils.jsm']
 EXTRA_PP_JS_MODULES += [
     'NewTabUtils.jsm',
     'Troubleshoot.jsm',
+    'UpdateUtils.jsm',
 ]
 
 if not CONFIG['MOZ_WEBEXTENSIONS']: