Issue 2537 - Don't assume "Chrome/" to be given in the user agent string

chrome/ext/background.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 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 342 matching lines @@
       // it multiple times, if multiple filters are added/removed.
       var onBeforeNavigate = chrome.webNavigation.onBeforeNavigate;
       if (!onBeforeNavigate.hasListener(propagateHandlerBehaviorChange))
         onBeforeNavigate.addListener(propagateHandlerBehaviorChange);
     }
   };
 
   // Since Chrome 38 requests of type 'object' (e.g. requests
   // initiated by Flash) are mistakenly reported with the type 'other'.
   // https://code.google.com/p/chromium/issues/detail?id=410382
-  if (parseInt(navigator.userAgent.match(/\bChrome\/(\d+)/)[1], 10) >= 38)
+  var match = navigator.userAgent.match(/\bChrome\/(\d+)/);
+  if (match && parseInt(match[1], 10) >= 38)
   {
     ext.webRequest.indistinguishableTypes = [
       ["OTHER", "OBJECT", "OBJECT_SUBREQUEST"]
     ];
   }
   else
   {
     ext.webRequest.indistinguishableTypes = [
       ["OBJECT", "OBJECT_SUBREQUEST"],
       ["OTHER", "MEDIA", "FONT"]
@@ skipping 279 matching lines @@
             callback(new Page(tab));
         }
         else
         {
           ext.pages.open(optionsUrl, callback);
         }
       });
     });
   };
 })();