Add the day number to the Wordle title.

wordledaynumber.user.js

// ==UserScript==
// @name         Wordle Day Number
// @namespace    http://tampermonkey.net/
// @version      0.5
// @description  Add the day number to the Wordle title.
// @author       Rangsk
// @match        https://www.nytimes.com/games/wordle/index.html
// @icon         https://www.google.com/s2/favicons?sz=64&domain=nytimes.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    const shim = function() {
        let title = document.querySelector('h1.AppHeader-module_title__EQr6V');
        if (title) {
            let epoch = new Date(2021, 5, 19, 0, 0, 0, 0);
            let now = Date.now();
            let dayOffset = Math.floor((now - epoch) / (1000 * 60 * 60 * 24));
            title.innerHTML = 'Wordle #' + dayOffset;
            return;
        }

        setTimeout(shim, 100);
    };

    setTimeout(shim, 100);
})();