Greasemonkey script to add URL to end of current page title

url_in_title.js

// ==UserScript==
// @name         URL in title
// @version      0.1
// @description  try to take over the world!
// @author       Raghav RV
// @updateURL https://gist.githubusercontent.com/raghavrv/eb2f44b43ef7d3287327a5fd5e3ee205/raw/url_in_title.js
// @downloadURL https://gist.githubusercontent.com/raghavrv/eb2f44b43ef7d3287327a5fd5e3ee205/raw/url_in_title.js
// @include http://*/*
// @include https://*/*
// @grant unsafeWindow
// @grant GM_addStyle
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_xmlhttpRequest
// @grant GM_registerMenuCommand
// @grant GM_deleteValue
// @grant GM_listValues
// @grant GM_getResourceText
// @grant GM_getResourceURL
// @grant GM_log
// @grant GM_openInTab
// @grant GM_setClipboard
// @grant GM_info
// @grant GM_getMetadata
// @run-at document-load
// @connect *
// ==/UserScript==

var google = false;

function appendUrlToTitle() {
	if (!document.title.endsWith("_____URL_")) {
		if (document.title === "") {
			setInterval(function() {
				// Remove any existing URLs
				document.title = (document.title.replace(/_____URL__.*_____URL_/, "") +
							  "_____URL__" + document.URL + "_____URL_");
				// console.log("Title changed after 1s");
			}, 1000);}
		else {
			document.title = (document.title.replace(/_____URL__.*_____URL_/, "") +
							  "_____URL__" + document.URL + "_____URL_");
			// console.log("Title changed");
		}
	}
}

window.onload = function(){
	appendUrlToTitle();
};

new MutationObserver(function(mutations) {
	// console.log('Mutation observed');
	setInterval(appendUrlToTitle, 1000);
}).observe(document.querySelector('title'), { subtree: true, characterData: true, childList: true });