Once the extension is installed in Firefox (Mac OS and Windows), Firesheep allows the theft of credentials from the following sites:

As Codebutler explains in its presentation once the Cookies and the user's sessions have been captured, it would be possible to impersonate it (Session Hijacking).
Solution: Forget about free Wifi, encrypt all end-to-end traffic, and enforce SSL everywhere
Cristian from the Segu-Info Newsroom

