stanikkk  Попробуй поменять в скрипте «about:blank» на «chrome-ui://new-tab/» или «chrome://new-tab/» (в разных версия по разному, в шапке вообще «chrome-resource:/new-tab/»).    
Добавлено:  Кстати, по поводу скриптов и в частности поддержки расширений GM_ (взято из chrome.dll) [more]
Код: [no] 
 // Implementation of the Greasemonkey API, see: 
 // 
http://wiki.greasespot.net/Greasemonkey_Manual:APIs  const MIN_INT_32 = -0x80000000; 
 const MAX_INT_32 = 0x7FFFFFFF;   
 // Prefix for user script values that are stored in localStorage. 
 const STORAGE_NS = "__userscript__.";   
 function GM_getValue(name, defaultValue) { 
   var value = localStorage.getItem(STORAGE_NS + name); 
   return value ? value : defaultValue; 
 }   
 function GM_setValue(name, value) { 
   // The values for GM_getValue() and GM_setValue() can only be boolean, 
   // strings, or 32 bit integers.  See the setPrefs function in: 
   // 
http://greasemonkey.devjavu.com/browser/trunk/src/chrome/chromeFiles/content/prefmanager.js    var goodType = false; 
   switch (typeof(value)) { 
     case "string": 
     case "boolean": 
       goodType = true; 
       break; 
     case "number": 
       // Note that "value % 1 == 0" checks that the number is not a float. 
       if (value % 1 == 0 && value >= MIN_INT_32 && value <= MAX_INT_32) { 
         goodType = true; 
       } 
       break; 
   }   
   if (!goodType) { 
     throw new Error("Unsupported type for GM_setValue. Supported types " + 
                     "are: string, bool, and 32 bit integers."); 
   }   
   localStorage.setItem(STORAGE_NS + name, value); 
 }   
 function GM_deleteValue(name) { 
   localStorage.removeItem(STORAGE_NS + name); 
 }   
 function GM_listValues() { 
   var values = []; 
   for (var i = 0; i < localStorage.length; i++) { 
     var key = localStorage.key(i); 
     if (key.indexOf(STORAGE_NS) == 0) { 
       key = key.substring(STORAGE_NS.length); 
       values.push(key); 
     } 
   } 
   return values; 
 }   
 function GM_getResourceURL(resourceName) { 
   throw new Error("not implemented."); 
 }   
 function GM_getResourceText(resourceName) { 
   throw new Error("not implemented."); 
 }   
 function GM_addStyle(css) { 
   var head = document.getElementsByTagName("head")[0]; 
   if (!head) { 
     return; 
   } 
   var style = document.createElement("style"); 
   style.type = "text/css"; 
   style.innerHTML = css; 
   head.appendChild(style); 
 }   
 function GM_xmlhttpRequest(details) { 
   throw new Error("not implemented."); 
 }   
 function GM_registerMenuCommand(commandName, commandFunc, accelKey, 
                                 accelModifiers, accessKey) { 
   throw new Error("not implemented."); 
 }   
 function GM_openInTab(url) { 
   window.open(url, ""); 
 }   
 function GM_log(message) { 
   window.console.log(message); 
 } [/no]