diff --git a/tools/extensions/activities/components/ActivitiesGlue.js b/tools/extensions/activities/components/ActivitiesGlue.js
index b3bf4aef3f76..79aaa8c03d4e 100644
--- a/tools/extensions/activities/components/ActivitiesGlue.js
+++ b/tools/extensions/activities/components/ActivitiesGlue.js
@@ -10,7 +10,6 @@ const Cu = Components.utils;
 
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/Services.jsm");
-Cu.import('resource://gre/modules/ObjectWrapper.jsm');
 
 function ActivitiesDialog() {
   this._id = 0;
@@ -55,7 +54,7 @@ ActivitiesDialog.prototype = {
 
     let event = content.document.createEvent('CustomEvent');
     event.initCustomEvent('mozChromeEvent', true, true,
-                          ObjectWrapper.wrap(detail, content));
+                          Cu.cloneInto(detail, content));
     content.dispatchEvent(event);
   },
 
diff --git a/tools/extensions/browser-helper@gaiamobile.org/content/shell.js b/tools/extensions/browser-helper@gaiamobile.org/content/shell.js
index 6ab832d3c4ca..8ab1fb890445 100644
--- a/tools/extensions/browser-helper@gaiamobile.org/content/shell.js
+++ b/tools/extensions/browser-helper@gaiamobile.org/content/shell.js
@@ -26,7 +26,7 @@ function sendChromeEvent(details, type) {
 
   let event = content.document.createEvent('CustomEvent');
   event.initCustomEvent(type, true, true,
-                        ObjectWrapper.wrap(details, content));
+                        Cu.cloneInto(details, content));
   content.dispatchEvent(event);
 }
 
@@ -34,7 +34,6 @@ function sendChromeEvent(details, type) {
 // Copy of /b2g/chrome/content/shell.js
 Cu.import('resource://gre/modules/Webapps.jsm');
 Cu.import('resource://gre/modules/AppsUtils.jsm');
-Cu.import('resource://gre/modules/ObjectWrapper.jsm');
 
 Services.obs.addObserver(function onLaunch(subject, topic, data) {
   let json = JSON.parse(data);