BlackSheep add-on combats Firesheep session hijacking tool

Last month Seattle programmer Eric Butler exposed the weaknesses of open Wi-Fi networks with his Firesheep add-on for FireFox. The program intercepts browser cookies to identify users and allows anyone running it to log into sites such as Facebook and Twitter as the legitimate user. While Butler wanted to encourage the use of HTTPS to combat such vulnerabilities, users can now combat Firesheep with another Firefox add-on – BlackSheep.

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