You need to upgrade to the latest version of The Camelizer, our browser add-on.
Mozilla Firefox:
http://camelcamelcamel.com/firefox_addon
Google Chrome:
http://camelcamelcamel.com/chrome_extension
After installing those, you will see a Camel icon -- in the status bar for Firefox, and in the address bar on supported pages for Chrome -- which will show our price history charts when clicked.