Firesheep co-author here. Thanks and agreed :)

Latest firefox tells me that site http://codebutler.github.io/firesheep/ is unsecure

got there from official blog https://codebutler.com/2010/10/24/firesheep/

Maybe force https when requesting http ?

https://drive.google.com/file/d/1maSpqYfFoBoCyao14VKzLKPMlm9...

Kudos for your work!

Definitely. Considering the plethora of unencrypted wifi SSIDs that were out there back then, it was huge. Massively reported on in the MSM, too