feedit/ext_localconf.php

<?php
if (!defined('TYPO3_MODE')) {
	die('Access denied.');
}
// Register the edit panel view.
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['typo3/classes/class.frontendedit.php']['edit'] = 'EXT:feedit/Classes/FrontendEditPanel.php:TYPO3\\CMS\\Feedit\\FrontendEditPanel';