Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.
window.catALotPrefs = {editpages:  true, minor: false};
mw.loader.using(['mediawiki.util']).done(function(){
  mw.loader.load('//commons.wikimedia.org/w/index.php?title=MediaWiki:Gadget-Cat-a-lot.js&action=raw&ctype=text/javascript');
  mw.loader.load('//commons.wikimedia.org/w/index.php?title=MediaWiki:Gadget-Cat-a-lot.css&action=raw&ctype=text/css', 'text/css');
});