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This addon was perfect for my needs: adding the signature at the current position of the cursor.
I said "was" because, unfortunately, it works no more with Thunderbird 60.
Is the developer planning a new release? Would be really appreciated.
Thanks

Questa recensione riguarda una versione precedente (0.4.2) del componente aggiuntivo. 

Thank you Erik. Thunderbird 60: not now, but we will see if mozilla releases a migration documentation how to migrate apps from xul to xpcom...