What is Firesheep?
You may remember about 4 years ago Eric Butler released a Firefox extension that did something very clever. It hooked into a packet capture library and could capture cookies that weren’t sent over SSL, at an open Wi-Fi access point. That extension was Firesheep. The press grabbed onto this story as it made “hacking” into someone’s Facebook account something almost anyone could do. At the time, many sites would shuttle you securely over https:// for the login and then give you an authentication cookie that was served insecurely over http://. This authentication cookie is the thing that proves you are who you say you are so if a bad guy got access to this cookie, they could easily impersonate you on that site.