Puntuado con 5 de 5 estrellas

A version working with the Element Properties add-on (recent Fx versions) is available in the MozillaZine forums:

Maybe you could adapt this tiny change? :)

Esta valoración es de una versión anterior del complemento (0.3.2). 

As promissed in my earlier reply, the just released 0.4 cooperates with the Element Properties extension.