diff --git a/lib/notifications.js b/lib/notifications.js
index 98d9dcb..aab433e 100644
--- a/lib/notifications.js
+++ b/lib/notifications.js
@@ -2,14 +2,15 @@
 /* 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/. */
-
+(function(){
+"use strict";
 
 var URL = require("sdk/url").URL;
 const {parseErrorStack} = require("./callingStack");
 
 var tabUtils = require("sdk/tabs/utils");
 exports.notify = function({url, errorStack, messageId}, {lists, notificationPref, _, browser, window}){
-	"use strict";
+	
 	var callingStackMsg = parseErrorStack(errorStack);
 	
 	var contentURL = new URL(url);
@@ -121,4 +122,5 @@ exports.notify = function({url, errorStack, messageId}, {lists, notificationPref
 		}
 		return notification;
 	}
-};
\ No newline at end of file
+};
+}());
\ No newline at end of file