Force Instagram dark mode using Tampermonkey

userscript.js

// ==UserScript==
// @name         Instagram Force Dark Mode
// @namespace    https://khaleelgibran.com
// @version      0.1
// @description  Append dark mode param to Instagram URLs!
// @author       Khaleel Gibran <hi@khaleelgibran.com>
// @match        https://www.instagram.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=instagram.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    if (!window.location.search.includes("theme=dark")) {
        window.location.replace("?theme=dark");
    }
})();

// fyi instagram web already has a dark mode implemented, it just needs `?theme=dark`