Assegnate 5 su 5 stelle

Have always like Noia. Description states a Black scheme option. How to install? Only see blue and gray options in Thunderbird. Thanks!!

Questa recensione riguarda una versione precedente (2.1.3.1-signed) del componente aggiuntivo. 

Thanks.
You cannot access to the black theme for Thunderbird. I have worked on it but there is still a lot of bugs. So this is the reason why this option is hidden.