Bird Favicon

change_favicon.js

// ==UserScript==
// @name         Change Favicon
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Change to original bird favicon.
// @author       You
// @match        https://*.twitter.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=twitter.com
// @grant        none
// ==/UserScript==

(function() {
    var link = document.querySelector("link[rel~='icon']");
    if (!link) {
        link = document.createElement('link');
        link.rel = 'icon';
        document.head.appendChild(link);
    }
    link.href = 'https://abs.twimg.com/favicons/favicon.ico';
})();