This specific attack should work just fine with WEP but will not work against WPA2 (Disclaimer: I haven't tried the combinations personally). With WEP every sin

This specific attack should work just fine with WEP but will not work against WPA2 (Disclaimer: I haven't tried the combinations personally). With WEP every single client uses the same encryption key, so all the packets are visible to everyone. With WPA2-PSK, each client has it's own key which is derived from the pre-shared key. Because of this, your adapter won't decode someone else's packets, but it's technically feasible to do so with other types of attacks outside of the scope of this firefox plugin. I'm not that familiar with the encryption within WPA-Enterprise, but I don't believe you can derive other people's keys and sniff their data when using it.