Does not work Noté 1 sur 5 étoiles

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

USELESS!!! Noté 1 sur 5 étoiles

Not working at iceweasel 31.
Useless.

Not Working on mozilla version-26 browser Noté 1 sur 5 étoiles

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