Running the site in a Chrome incognito window or a FireFox, Internet Explorer, Safari private browsing session will stop all 3rd party tracking. Otherwise you could use the browser plug-in Ghostery which can selectively halt individual 3rd party functionality. You can also access the site via HTTPS which does not implement these 3rd party tools.
CFID CFTOKEN PERSISTSESSION CF_CLIENT_DEFACTO2 MAX-WIDTH. CFID contains a sequential client identifier. CFTOKEN holds a random-number client security token. These plus CF_CLIENT_DEFACTO2 and PERSISTSESSION are used internally by our web server for browser session tracking. Session tracking is used to remember your last Art & files, Groups & sites, People and Websites actions. This is designed for convince and can be blocked with no consequence. MAX-WIDTH is used to store the adjust max-width slider value.