A TamperMonkey script that will set the favicon of the page to the page icon of coda

coda-favicon.js

// ==UserScript==
// @name         Change coda favicon
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       Kitze
// @match        https://coda.io/*
// @icon         data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
// @grant        none
// ==/UserScript==
(function() {
  'use strict';

  function onDocReady(fn) {
    // see if DOM is already available
    if (document.readyState === "complete" || document.readyState === "interactive") {
      // call on next available tick
      setTimeout(fn, 1000);
    } else {
      document.addEventListener("DOMContentLoaded", fn);
    }
  }

  const changeFavicon = () => {
    var link = document.querySelector("link[rel~='icon']");
    const head = document.getElementsByTagName('head')[0];
    if (!link) {
      link = document.createElement('link');
    }
    const icon = document.querySelector("[data-scroll-id=\"canvasScrollContainer\"] .UeEE5Inb");
    if (icon) {
      link.href = icon.src;
      link.rel = 'icon';
      head.appendChild(link);
    }
  }

  onDocReady(changeFavicon);
})();