Here is my config.inc.php

<?php
$cfg['Servers'][1]['auth_type'] = 'http';
$cfg['Servers'][1]['extension'] = 'mysqli';
?>

If I leave phpMyAdmin for a while and come back, if I click somewhere, it asks for credentials but It will keep asking it forever. I need to go back to the root dir of my phpMyAdmin in order to log in again.

By the way, few years ago, with the same config I wouldn't have to log in again after a while... That was much more useful for developing, when you have to try out a few things before coming back to the database...

Apache/2.4.18 (Ubuntu)
Database client version: libmysql - mysqlnd 5.0.11-dev - 20120503 - $Id: 3c688b6bbc30d36af3ac34fdd4b7b5b787fe5555 $
PHP extension: mysqli Documentation
PHP version: 5.6.17-3+deb.sury.org~wily+1

Version information: 4.5.4 (up to date)