Adds a Info &action=info link tab of regular articles to your MediaWiki Skin allowing quick displaying of page informations.
Download and upload the zip file to /extensions and extract. Rename directory folder /Info-#-#-# to /Info and add the following to LocalSettings.php to enable this extension.
wfLoadExtension( 'Info' );
Control the ability by user group to info content. eg ['*'] would allow anyone, ['user'] allows only users or ['sysop'] would only allow sysops.
Allow viewing Info for a specific user group:
$wgGroupPermissions['{a user group}']['info'] = true;
See https://www.mediawiki.org/wiki/Extension:Info for more information about displaying a page's informations.