Hi malware fighters,
Here you can read about the royal way to spy on your browser (FF, IE), malicious javascript inside bookmarklets:
http://www.hunlock.com/blogs/Bookmarklets_--_The_Evil_Lurking_In_Your_Browser
polonus
PS To give you a sense of the dark power, look what snooper.js bookmark, named Snoop Test does, and it give specifics on cookies of every page you visit:
javascript:(function(){var s=document.createElement("script"); s.src="http://www.hunlock.com/examples/snooper.js"; document.body.appendChild(s);})();