Tempermonkey userscript to enable dark theme on StackExchange websites by default

stackexchange-dark-theme.userscript.js

// ==UserScript==
// @name         StackExchange dark theme
// @namespace    http://tampermonkey.net/
// @version      2026-02-27
// @description  Enable dark theme on StackExchange websites by default
// @author       RuslanUC
// @match        https://stackoverflow.com/*
// @match        https://meta.stackoverflow.com/*
// @match        https://askubuntu.com/*
// @match        https://stackexchange.com/*
// @match        https://*.stackexchange.com/*
// @match        https://serverfault.com/*
// @match        https://superuser.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=stackoverflow.com
// @grant        none
// @run-at       document-body
// ==/UserScript==

(function() {
    'use strict';
    document.body.classList.add("theme-dark");
})();