On a Wikipedia article, move navboxes to the top of the page. Navboxes are the informative boxes with many further links on the topic, normally (but not always) at the bottom of a Wikipedia article.

wikipedia-move-navboxes-to-top-userscript.js

// ==UserScript==
// @name         Move All Navboxes to Top
// @namespace    http://your.namespace.com
// @version      1.0
// @description  On a Wikipedia article, move navboxes, if they exist, to the top of the page
// @author       Your Name
// @match        *://en.wikipedia.org/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    var navboxes = document.querySelectorAll('.navbox');

    // This is where the wikipedia article starts
    var mwContent = document.querySelector('.mw-content-ltr');

    if (navboxes.length > 0 && mwContent) {
        var fragment = document.createDocumentFragment();

        navboxes.forEach(function(navbox) {
            fragment.appendChild(navbox);
        });

        mwContent.insertBefore(fragment, mwContent.firstChild);
    }
})();