Assegnate 5 su 5 stelle

I have Signature working in FF3, and this is how I did it:
http://planetzarg.blogspot.com/2008/06/install-signature-extension-for-firefox.html

Alternatively, have you tried inoculate128's method in the comments below?

Questa recensione riguarda una versione precedente (0.4.0.5.20070419) del componente aggiuntivo.