A new extension for the Firefox web browser called Firesheep can be used by everyone to steal account information from users logging on to unencrypted websites through unsecured wifi networks. Source said that it works by collecting user information and showing it in a Firefox window; Firesheep then lets each account be taken over simply by clicking on it. What a simple way then to hack Facebook and Twitter accounts. It was developed by Eric Butler, a freelance web application and software developer who hails from Seattle, Washington, U.S.A. He developed this free, open source Firefox extension, which is currently available for Windows and Mac OS X. He wrote that support for Linux is on its way. According to Butler, he built the extension because “it's extremely common for websites to protect your password by encrypting the initial login, but surprisingly uncommon for websites to encrypt everything else. Websites have a responsibility to protect the people who depend on their services. They've been ignoring this responsibility for too long, and it's time for everyone to demand a more secure web. My hope is that Firesheep will help the users win.†Source: http://www.bazics.net/2010/10/firesheep-exposes-hacks-facebook-and.html
Creepy and scary! Your link even has screen captures and easy instructions. But it makes me wonder if the firefox plugin itself is hack. How can one be sure! Paranoid or cautious?