Issue 4795 - Use modern JavaScript syntax

composer.postload.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 62 matching lines @@
     if (!(element instanceof HTMLElement) || element.localName == "area")
       element = element.parentElement;
 
     // If image maps are used mouse events occur for the <area> element.
     // But we have to block the image associated with the <map> element.
     else if (element.localName == "map")
     {
       let images = document.querySelectorAll("img[usemap]");
       let image = null;
 
-      for (let i = 0; i < images.length; i++)
+      for (let currentImage of images)
       {
-        let usemap = images[i].getAttribute("usemap");
+        let usemap = currentImage.getAttribute("usemap");
         let index = usemap.indexOf("#");
 
         if (index != -1 && usemap.substr(index + 1) == element.name)
         {
-          image = images[i];
+          image = currentImage;
           break;
         }
       }
 
       element = image;
     }
 
     // Finally, if none of the above is true, check whether we can generate
     // any filters for this element. Otherwise fall back to its parent element.
     else
@@ skipping 57 matching lines @@
   overlay.style.zIndex = 0x7FFFFFFE;
 
   document.documentElement.appendChild(overlay);
   return overlay;
 }
 
 function highlightElement(element, shadowColor, backgroundColor)
 {
   unhighlightElement(element);
 
-  let highlightWithOverlay = function()
+  let highlightWithOverlay = () =>
   {
     let overlay = addElementOverlay(element);
 
     // If the element isn't displayed no overlay will be added.
     // Moreover, we don't need to highlight anything then.
     if (!overlay)
       return;
 
     highlightElement(overlay, shadowColor, backgroundColor);
     overlay.style.pointerEvents = "none";
 
     element._unhighlight = () =>
     {
       overlay.parentNode.removeChild(overlay);
     };
   };
 
-  let highlightWithStyleAttribute = function()
+  let highlightWithStyleAttribute = () => 
   {
     let originalBoxShadow = element.style.getPropertyValue("box-shadow");
     let originalBoxShadowPriority =
       element.style.getPropertyPriority("box-shadow");
     let originalBackgroundColor =
       element.style.getPropertyValue("background-color");
     let originalBackgroundColorPriority =
       element.style.getPropertyPriority("background-color");
 
     element.style.setProperty("box-shadow", "inset 0px 0px 5px " + shadowColor,
@@ skipping 384 matching lines @@
             }
           });
         }
         break;
     }
   });
 
   if (window == window.top)
     ext.backgroundPage.sendMessage({type: "composer.ready"});
 }