BlackSheep - A Tool To Detect Firesheep

**BlackSheep** is a Firefox add-on that helps users detect the presence of Firesheep session‑hijacking on local networks by periodically generating fake HTTP session traffic and watching the network for active requests that reuse those fake cookies; the post outlines Firesheep's passive cookie capture then active session probing behavior, explains how BlackSheep reuses Firesheep's backend and site lists to create realistic decoys, and provides installation, configuration, and usage guidance for Mac, Windows, and Linux.