“Firesheep” lets “pretty much anyone” scan a Wi-Fi network and hijack others’ access to Facebook, Twitter. Add-on shows when anyone on an open network visits an insecure site. Among the sites that Firesheep can hijack are Facebook, Flickr, bit.ly, Google and Amazon. The add-on can be downloaded free-of-charge from the GitHub site, which is available for Windows and Mac OS X versions of Firefox. Security expert: “None of this is new, the flaw certainly isn’t””]
Source: https://www.csoonline.com/article/2126065/new-firefox-add-on-hijacks-facebook–twitter-sessions.html