Assegnate 1 su 5 stelle

Hey there,

Not sure what it is exactly that is supposed to happen, but all I get is the default Thunderbird icon (the tiny red one) along with the default *plopp* sound, all of which I get also without having the addon installed.

Background info:
Thunderbird 24.2.0 on Ubuntu 13.10/Unity
I am using the chat in combination with my Google account.
Any ideas?

Thanks!