In late 2010, software developer Eric Butler released a Firefox extension called Firesheep. It worked like this: you would connect to a public Wi-Fi network, like at a train station or a coffee shop. When installed and active, the extension would continuously analyze (unencrypted) data in the current wireless network. If someone else in the same network was logged into one of a select number of sites, a window popped up, prompting you to go to that site, as that other person. And indeed, one click later, you could access a third-party site as the person sitting close to you. Those sites included