This sounds bad.

[conuly]

Firesheep In Wolves’ Clothing: Extension Lets You Hack Into Twitter, Facebook Accounts Easily

What is this, why is this, and how scary is it?

Comments

[prezzey.livejournal.com]

In practice IMO it's only dangerous if you are on an open wifi network (or a LAN where you do not trust all the computers physically connected to the network - I've been in that situation) and you transmit sensitive information unencrypted. Which is something you should not do, anyway. There are people who run open wifi networks only to capture the data of people using their hotspot.

This thing just grabs cookies but there are tools which grab everything and you can cherry-pick. I think the key attraction here is that this piece of software does not require much by way of technical expertise.