Issue 498 - Don't use Shadow DOM on Chrome 31-33

include.preload.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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.
  *
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  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 var SELECTOR_GROUP_SIZE = 20;
 
 // use Shadow DOM if available to don't mess with web pages that
 // rely on the order of their own <style> tags. However
 // the <shadow> element is broken in some Chrome 32 builds (#309)
 //
+// also Chrome 31-33 crashes in some situations on some pages when using
+// ShadowDOM, e.g. when pressing tab key on Wikipedia and Facebook (#498)
+//
 // also we must not create the shadow root in the response callback passed
 // to sendMessage(), otherwise Chrome breaks some websites (#450)
 var shadow = null;
-if ("webkitCreateShadowRoot" in document.documentElement && !/\bChrome\/32\b/.test(navigator.userAgent))
+if ("webkitCreateShadowRoot" in document.documentElement && !/\bChrome\/3[1-3]\b/.test(navigator.userAgent))
 {
   shadow = document.documentElement.webkitCreateShadowRoot();
   shadow.appendChild(document.createElement("shadow"));
 }
 
 // Sets the currently used CSS rules for elemhide filters
 function setElemhideCSSRules(selectors)
 {
   if (selectors.length == 0)
     return;
@@ skipping 92 matching lines @@
     ext.backgroundPage.sendMessage({type: "add-key-exception", token: attr});
 
   ext.backgroundPage.sendMessage({type: "get-selectors"}, setElemhideCSSRules);
 }
 
 // In Chrome 18 the document might not be initialized yet
 if (document.documentElement)
   init();
 else
   window.setTimeout(init, 0);