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.
// [[User:Lupin/popups.js]]

mw.loader.load(
             'https://en.wiki.x.io/w/index.php?title=User:Lupin/popups.js'
             + '&action=raw&ctype=text/javascript&dontcountme=s');

// install [[User:Cacycle/wikEd]] in-browser text editor

document.write('<script type="text/javascript" src="'
            + 'http://en.wiki.x.io/w/index.php?title=User:Cacycle/wikEd.js'
            + '&action=raw&ctype=text/javascript"></' + 'script>');