Things to enhance your Cookie Clicker experience.
For very basic advice on what to buy, either run this in your browser's javascript console:
(function(){var s=document.createElement("script");s.type="text/javascript";s.src="https://raw.github.com/robstarling/cookie-clicker-addons/master/helper.js";document.body.appendChild(s);})();
or add a bookmark with this url:
javascript:(function(){var s=document.createElement("script");s.type="text/javascript";s.src="https://raw.github.com/robstarling/cookie-clicker-addons/master/helper.js";document.body.appendChild(s);})();
and click on it when you're on Cookie Clicker to get new UI elements to help you.