AWS Account ID in browser's tab title

script.js

// ==UserScript==
// @name         Account ID in Tab Title
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://*.console.aws.amazon.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Your code here...
    setInterval(() => {
        const el = document.querySelector('[data-testid="aws-my-account-details"]');
        if (el == null) { return; }
        const accountId = el.innerText;
        const accountIdSubstr = accountId.substr(-4);


        if (document.title.startsWith('[')) {
            document.title = document.title.substr(8);
        }

        document.title = '[*' + accountIdSubstr + '] ' + document.title;

    }, 5000)

})();