Thank you for this extension. Connection to databases using unix_socket fails.
The test for connection is on $GLOBALS['TYPO3_CONF_VARS']['DB']['socket'] but it should be on $dbData['unix_socket'] , i.e. $GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['unix_socket'].
// If a socket connection is configured, use this for mysqli
if (isset($dbData['unix_socket'])) {
$_SESSION['PMA_typo3_socket'] = $dbData['unix_socket'];
}