Assegnate 3 su 5 stelle

I like this extension.

But since TB 3.1 it can no longer be installed as global extension (see http://kb.mozillazine.org/Installing_extensions#Global_installation). TB reports it as 'incompatible' with this version (tried TB 5, 6 and 7).

Single-user Installation works!?

Questa recensione riguarda una versione precedente (1.1.3) del componente aggiuntivo. 

Support for global installation is something that was removed from Thunderbird, Firefox etc (i.e. gecko). It is not something that can be affected by this extension.