Disable google's automatic "Stay signed in" checkbox at GMail login page
// ==UserScript==
// @author tm1
// @name Uncheck Stay signed in checkbox (Remember PersistentCookie) at GMail login page
// @namespace nothing
// @description Disable google's automatic "Stay signed in" checkbox at GMail login page
// @include http://accounts.google.tld/*
// @include http://accounts.google.com/*
// @include https://accounts.google.tld/*
// @include https://accounts.google.com/*
// @version 1.0.1
// @grant none
// ==/UserScript==
var chkbox = document.getElementById('PersistentCookie');
chkbox.removeAttribute('checked');