Does not work Assegnate 1 su 5 stelle

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

USELESS!!! Assegnate 1 su 5 stelle

Not working at iceweasel 31.
Useless.

Not Working on mozilla version-26 browser Assegnate 1 su 5 stelle

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