Index: typo3/mod/tools/em/class.em_index.php
===================================================================
--- typo3/mod/tools/em/class.em_index.php	(Revision 6782)
+++ typo3/mod/tools/em/class.em_index.php	(Arbeitskopie)
@@ -514,6 +514,7 @@
 				5 => $GLOBALS['LANG']->getLL('show_changed'),
 			),
 			'display_shy' => '',
+			'hide_system' => '',
 			'display_own' => '',
 			'display_unchecked' => '',
 			'display_obsolete' => '',
@@ -604,6 +605,9 @@
 			if (t3lib_div::inList('2',$this->MOD_SETTINGS['function']) && strlen($this->fe_user['username']))	{
 				$menu.='<label for="checkDisplayOwn">' . $GLOBALS['LANG']->getLL('only_my_ext') . '</label>&nbsp;&nbsp;' . t3lib_BEfunc::getFuncCheck(0, 'SET[display_own]', $this->MOD_SETTINGS['display_own'], '', '', 'id="checkDisplayOwn"');
 			}
+			if (t3lib_div::inList('0,1,5',$this->MOD_SETTINGS['function']))	{
+				$menu.='<label for="hide_system">' . $GLOBALS['LANG']->getLL('hide_system') . '</label>&nbsp;&nbsp;' . t3lib_BEfunc::getFuncCheck(0, 'SET[hide_system]', $this->MOD_SETTINGS['hide_system'], '', '', 'id="hide_system"');
+			}
 			if (t3lib_div::inList('0,1,2',$this->MOD_SETTINGS['function']))	{
 				$menu.='&nbsp;&nbsp;<label for="checkDisplayObsolete">' . $GLOBALS['LANG']->getLL('show_obsolete') . '</label>&nbsp;&nbsp;' . t3lib_BEfunc::getFuncCheck(0, 'SET[display_obsolete]', $this->MOD_SETTINGS['display_obsolete'], '', '', 'id="checkDisplayObsolete"');
 			}
@@ -754,7 +758,11 @@
 				reset($extEkeys);
 				$extensions = array();
 				while(list($extKey)=each($extEkeys))	{
-					if (array_key_exists($extKey,$TYPO3_LOADED_EXT) && ($this->MOD_SETTINGS['display_shy'] || !$list[$extKey]['EM_CONF']['shy']) && $this->searchExtension($extKey,$list[$extKey]))	{
+					if (array_key_exists($extKey, $TYPO3_LOADED_EXT) &&
+							($this->MOD_SETTINGS['display_shy'] || !$list[$extKey]['EM_CONF']['shy']) &&
+							(!$this->MOD_SETTINGS['hide_system']  || ($this->MOD_SETTINGS['hide_system'] && $list[$extKey]['type'] !== 'S')) &&
+							$this->searchExtension($extKey,$list[$extKey])
+						)	{
 						if (in_array($extKey, $this->requiredExt))	{
 							$loadUnloadLink = '<strong>' . $GLOBALS['TBE_TEMPLATE']->rfw($GLOBALS['LANG']->getLL('extension_required_short')) . '</strong>';
 						} else {
Index: typo3/sysext/lang/locallang_mod_tools_em.xml
===================================================================
--- typo3/sysext/lang/locallang_mod_tools_em.xml	(Revision 6782)
+++ typo3/sysext/lang/locallang_mod_tools_em.xml	(Arbeitskopie)
@@ -61,6 +61,7 @@
 			<label index="show">Show:</label>
 			<label index="display_shy">Display shy extensions:</label>
 			<label index="only_my_ext">Only my extensions:</label>
+			<label index="hide_system">Hide system extensions:</label>
 			<label index="show_obsolete">Show obsolete:</label>
 			<label index="go_back">Go back</label>
 			<label index="look_up">Look up:</label>