MediaWiki:Common.js

Note: After publishing, you may have to bypass your browser's cache to see the changes.

Firefox / Safari: Hold Shift while clicking Reload, or press either Ctrl-F5 or Ctrl-R (⌘-R on a Mac)
Google Chrome: Press Ctrl-Shift-R (⌘-Shift-R on a Mac)
Edge: Hold Ctrl while clicking Refresh, or press Ctrl-F5.

mw.loader.using('mediawiki.util').done(function() {
    const script = document.createElement('script');
    script.src = '/extensions/SliderExtension/modules/slider.js';
    document.head.appendChild(script);
});