RejZoR
12
Referrer is nothing else as browsers URL buffer. Browser opens certain URL and then stores it into this “buffer”. Any page that you visit after this one can check the referrer and see where you came from.
This method is also used for anti-leech systems that prevent hot-linking.
If browser is any good it can enable or disable referrer support.
Opera and Mozilla have such feature,so you really don’t need a firewall to block it…