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This Firesheep extension can show you a graphical list of the online accounts of everyone sharing an open wireless network with you. With one click on an icon, you’re instantly logged in as them.
...
.. the Firefox add-on is actually exploiting a problem that has been known to exist for a decade.
Until recently, the security loophole has been used by people with the knowledge and experience to exploit it. But this tool allows anyone to easily brows your personal information ...
Firesheep banks on the fact that most social sites default to the HTTP protocol because it’s quicker. The already existing Firefox extension Force-TLS attempts to circumvent this by forcing those sites to use the HTTPS protocol, therefore making user cookies invisible to Firesheep.
Anytime you’re using an open Wi-Fi connection, anyone can swiftly access some of your most private, personal information and correspondence (i.e. direct messages, Facebook mail/chat)— at the click of a button.