FFsniFF is a simple Firefox extension, which transforms your browser into the html form sniffer. Every time the user click on Submit button, FFsniFF will try to find a non-blank password field in the form. If its found, entire form (also with URL) is sent to the specified e-mail address. It also has the ability to hide itself in the Extensions manager. This extension is meant to be as an example of the evil side of Firefox extensions.