The following harmless demo will attempt to snatch a coookie from google.pl and display it for you. It is somewhat dependent on network timing and similar factors, and you obviously need Javascript to proceed, and you need to accept Google cookies. Tested on most recent MSIE 6 & 7, as of this writing that is (June 3, 2007). No, Firefox is not vulnerable. No, I have no clue about Opera, Safari, Konqueror and whatnot.