Index: typo3/mod/tools/em/class.em_index.php
===================================================================
--- typo3/mod/tools/em/class.em_index.php	(revision 6190)
+++ typo3/mod/tools/em/class.em_index.php	(working copy)
@@ -2250,7 +2250,19 @@
 						}
 						if (!$updates || t3lib_div::_GP('_do_install')) {
 							$this->writeNewExtensionList($newExtList);
-							$GLOBALS['BE_USER']->writelog(5,1,0,0,'Extension list has been changed, extension %s has been %s',array($extKey,($this->CMD['load']?'installed':'removed')));
+							$action = $this->CMD['load'] ? 'installed' : 'removed';
+							$GLOBALS['BE_USER']->writelog(5, 1, 0, 0, 'Extension list has been changed, extension %s has been %s', array($extKey, $action));
+
+							$messageLabel = 'ext_details_ext_' . $action . '_with_key';
+							$flashMessage = t3lib_div::makeInstance(
+								't3lib_FlashMessage',
+								sprintf($GLOBALS['LANG']->getLL($messageLabel), $extKey),
+								'',
+								t3lib_FlashMessage::OK,
+								TRUE
+							);
+							t3lib_FlashMessageQueue::addMessage($flashMessage);
+
 							if ($this->CMD['clrCmd'] || t3lib_div::_GP('_clrCmd'))	{
 								if ($this->CMD['load'] && @is_file($absPath.'ext_conf_template.txt')) {
 									$vA = array('CMD'=>Array('showExt'=>$extKey));
Index: typo3/sysext/lang/locallang_mod_tools_em.xml
===================================================================
--- typo3/sysext/lang/locallang_mod_tools_em.xml	(revision 6190)
+++ typo3/sysext/lang/locallang_mod_tools_em.xml	(working copy)
@@ -212,6 +212,8 @@
 			<label index="ext_details_remove_ext">Remove extension</label>
 			<label index="ext_details_removing">Removing %s:</label>
 			<label index="ext_details_ext_installed_removed">The extension has been %s.</label>
+			<label index="ext_details_ext_installed_with_key">The extension "%s" has been installed.</label>
+			<label index="ext_details_ext_removed_with_key">The extension "%s" has been removed.</label>
 			<label index="ext_details_installed">installed</label>
 			<label index="ext_details_removed">removed</label>
 			<label index="ext_details_write_access_error">Write access error</label>