Does not work Puntuado con 1 de 5 estrellas

This add-one does not work on last version of firefox

USELESS!!! Puntuado con 1 de 5 estrellas

Not working at iceweasel 31.
Useless.

Not Working on mozilla version-26 browser Puntuado con 1 de 5 estrellas

I have installed Redmine Issue Checker on my Mozilla version 26 browser, but it doesn't work.