Index: chrome/ext/popup.js
diff --git a/chrome/ext/popup.js b/chrome/ext/popup.js
index 40932374211505989553c15352d2e7215e7d07da..f5132aa457a4366129078917064aefc9092ebc42 100644
--- a/chrome/ext/popup.js
+++ b/chrome/ext/popup.js
@@ -1,9 +1,10 @@
-(function()
+"use strict";
+
 {
-  var backgroundPage = chrome.extension.getBackgroundPage();
-  window.ext = Object.create(backgroundPage.ext);
+  const backgroundPage = chrome.extension.getBackgroundPage();
+  var ext = Object.create(backgroundPage.ext);
 
-  ext.closePopup = function()
+  ext.closePopup = () =>
   {
     window.close();
   };
@@ -13,9 +14,9 @@
   ext.backgroundPage = {
     sendMessage: chrome.runtime.sendMessage,
 
-    getWindow: function()
+    getWindow()
     {
       return backgroundPage;
     }
   };
-})();
+}