/**
  * Get a list of loaded / active extensions
  *
  * @return array Array of installed
  */
 public static function getLoadedExtensions()
 {
     if (self::$loadedExtensions !== NULL) {
         return self::$loadedExtensions;
     }
     $loadedExtensions = array();
     $installedExtensions = self::getInstalledExtensions();
     foreach ($installedExtensions as $key) {
         if (count($GLOBALS['TYPO3_LOADED_EXT'][$key]) > 2) {
             $loadedExtensions[] = $key;
         }
     }
     self::$loadedExtensions = $loadedExtensions;
     return $loadedExtensions;
 }