Issue 4330 - Avoid suggesting huge URL filters

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 24 matching lines @@
 
 // Last right click state stored for element blocking via the context menu.
 let lastRightClickEvent = null;
 let lastRightClickEventIsMostRecent = false;
 
 
 /* Utilities */
 
 function getFiltersForElement(element, callback)
 {
+  let src = element.getAttribute("src");
   ext.backgroundPage.sendMessage(
   {
     type: "composer.getFilters",
     tagName: element.localName,
     id: element.id,
-    src: element.getAttribute("src"),
+    src: src && src.length <= 1000 ? src : null,
     style: element.getAttribute("style"),
     classes: Array.prototype.slice.call(element.classList),
     urls: getURLsFromElement(element),
     mediatype: typeMap[element.localName],
     baseURL: document.location.href
   },
   response =>
   {
     callback(response.filters, response.selectors);
   });
@@ skipping 515 matching lines @@
             }
           });
         }
         break;
     }
   });
 
   if (window == window.top)
     ext.backgroundPage.sendMessage({type: "composer.ready"});
 }