Alternative Puntuado con 5 de 5 estrellas

I was wrong, an update is released, good addon is back to function again.

Thanks to the developer.

[scraped]...this addon has not been updated since 2010, so chances that it will be updated are low...[/scraped]

Esta valoración es de una versión anterior del complemento (0.45.6.20100202.1). 

It has not been updated since there was no need. I'm using it myself, so when it needs fixing, it gets fixed. FF21 update was already uploaded and currently waiting for approval.