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It seems to be a problem, because I have installed the add-on, restarted Thunderbird, but the button don't appears when I try to customize my toolbar. I'm doing this in the drafting window, not the main. I use Thnderbird 5.0. What I'm doing wrong???

Questa recensione riguarda una versione precedente (0.2) del componente aggiuntivo. 

hi pdrmoz, there is no button at all! if you open a new email then you can right-klick in the mail (where you would like to get your signature to) and there you find it.