Firefox has a plugin that lets you see what is happening behind the scenes at sites you visit. Get lightbeam for firefox made by moziila.
http://www.thedenverchannel.com/money/consumer/cyber-security/free-lightbeam-browser-add-on-shines-a-light-on-who-is-watching-you-online (http://www.thedenverchannel.com/money/consumer/cyber-security/free-lightbeam-browser-add-on-shines-a-light-on-who-is-watching-you-online)