srbija035yahoo.com / gmail check

// ==UserScript==
// @name        gmail check
// @namespace   gmail check
// @description gmail check
// @version     1
// @include https://mail.google.com/*
// @grant          GM_xmlhttpRequest
// ==/UserScript==

var newHTML = document.createElement ('div');
newHTML.innerHTML = 
	'<div id="gmSomeID" class="rP"><p><a href="https://mail.google.com/mail/u/0/#settings/accounts">Check mail now</a></p></div>';
document.body.appendChild (newHTML);