The article doesn't go far enough. With this freely available tool, and almost no knowledge, a hacker can not only read your email and post to your accounts, they can literally take control of your computer and use it to commit any number of computer crimes. All without the knowledge of the user, all audit trails will lead to the user.
For the ethical hackers in the audience, here's the link to Firesheep. Contrary to the article, it is not a Firefox add-on, at least it's not available at Mozilla.org.
Read full article at Protect Yourself from Programs Hackers use to Read Your Wireless Emails
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