Puntuado con 5 de 5 estrellas

That's it!!! I tried to use the html code you suggested <br> and after ticking the html format box at the top of the signature box, it works just fine now. Thank you for your add on and for your time and good advice. Unlike soem of the reviewers, I think it's a great feature to be able to decide when you want your signature to be inserted or not. Cheers,
R.

Esta valoración es de una versión anterior del complemento (0.2).  Este usuario tiene 4 valoraciones anteriores de este complemento.

Perfect! Thank you for using add-signature :-)
I think this feature should be a default of thunderbird.