hotpotato.user.js

// ==UserScript==
// @name           hotpotato
// @namespace      hotpotato
// @description    hotpotato
// @include        http://hotpotato.heroku.com/*
// ==/UserScript==



// Add jQuery
    (function(){
        if (typeof unsafeWindow.jQuery == 'undefined') {
            var GM_Head = document.getElementsByTagName('head')[0] || document.documentElement,
                GM_JQ = document.createElement('script');
    
            GM_JQ.src = 'http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js';
            GM_JQ.type = 'text/javascript';
            GM_JQ.async = true;
    
            GM_Head.insertBefore(GM_JQ, GM_Head.firstChild);
        }
        GM_wait();
    })();

// Check if jQuery's loaded
    function GM_wait() {
        if (typeof unsafeWindow.jQuery == 'undefined') {
            window.setTimeout(GM_wait, 100);
        } else {
            $ = unsafeWindow.jQuery;
            letsJQuery();
        }
    }

// All your GM code must be inside this function
    function letsJQuery() {
			document.timer = setInterval(function () { if ($('button').length) { $('button').click(); unsafeWindow.clearInterval(document.timer); return; }  }, 100);
    }