Well today i bring you a way to protect yourself and everyone around you on a public network. As ppl have commented that addon IS illegal to use on public networks. It was developed to test security and should be only used as such. Unfortunately the way it was released was very irresponsible. The developers took something that is a great tool and made it into a real problem on the internet.
Fortunately for everyone who wants to keep their info private there is a way to do this and mess with the people using firesheep. I would advise anyone who is scared of someone running this program to download FireSheperd.
The only bad news is that this will only protect you from firesheep and not other ways to get this same info. Good news is the other methods are not as well known to every internet user. No matter what you should always be careful about what you do on a public network.
FireShepherd, a small console program that floods the nearby wireless network with packets designed to turn off FireSheep, effectively shutting down nearby FireSheep programs every 0.5 sec or so, making you and the people around you secure from most people using FireSheep.
The program kills the current version of FireSheep running nearby, but the user is still in danger of all other session hijacking mechanisms. Do not do anything over a untrusted network that you cannot share with everyone.
-Know that this is only a temporary solution to the FireSheep problem, created to give people the chance to secure themselves and the others around them from the current threat, while the security vulnerabilities revealed by FireSheep are being fixed.