Index: t3lib/class.t3lib_matchcondition.php
===================================================================
--- t3lib/class.t3lib_matchcondition.php	(revision 5742)
+++ t3lib/class.t3lib_matchcondition.php	(working copy)
@@ -360,6 +360,17 @@
 			case 'compatVersion':
 				return t3lib_div::compat_version($value);
 			break;
+			case 'ext':
+				$values = explode(',', $value);
+				foreach($values as $test)	{
+					$test = trim($test);
+					if (strlen($test)) {
+						if (t3lib_extMgm::isLoaded($test)) {
+							return true;
+						}
+					}
+				}
+			break;
 			case 'userFunc':
 				$values = preg_split('/\(|\)/', $value);
 				$funcName = trim($values[0]);