Index: typo3/sysext/setup/mod/locallang.xml
===================================================================
--- typo3/sysext/setup/mod/locallang.xml	(revision 7180)
+++ typo3/sysext/setup/mod/locallang.xml	(working copy)
@@ -89,6 +89,7 @@
 			<label index="resetConfiguration">Reset Configuration and Clear Temporary Data</label>
 			<label index="setToStandardQuestion">Are you sure you want to reset all values to default?</label>
 			<label index="clearSessionVars">Clear Temporary Data</label>
+			<label index="clearSessionVarsQuestion">Are you sure you want to clear the temporary data?</label>
 			<label index="functions">Advanced functions</label>
 			<label index="copyLevels">&lt;b&gt;Recursive Copy:&lt;/b&gt; Enter the number of page&lt;br /&gt;sublevels to include, when a page is copied</label>
 			<label index="recursiveDelete">&lt;b&gt;Recursive Delete(!):&lt;/b&gt; Allow ALL subpages&lt;br /&gt;to be deleted when deleting a page</label>
Index: typo3/sysext/setup/mod/index.php
===================================================================
--- typo3/sysext/setup/mod/index.php	(revision 7180)
+++ typo3/sysext/setup/mod/index.php	(working copy)
@@ -367,7 +367,7 @@
 			<input type="hidden" name="simUser" value="'.$this->simUser.'" />
 			<input type="submit" name="submit" value="'.$LANG->getLL('save').'" />
 			<input type="submit" name="data[setValuesToDefault]" value="'.$LANG->getLL('resetConfiguration').'" onclick="return confirm(\''.$LANG->getLL('setToStandardQuestion').'\');" />
-			<input type="submit" name="data[clearSessionVars]" value="'.$LANG->getLL('clearSessionVars').'" />'
+			<input type="submit" name="data[clearSessionVars]" value="' . $LANG->getLL('clearSessionVars') . '"  onclick="return confirm(\'' . $LANG->getLL('clearSessionVarsQuestion') . '\');" />'
 		);