Does not work Ohodnoceno 1 z 5 hvězdiček

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

USELESS!!! Ohodnoceno 1 z 5 hvězdiček

Not working at iceweasel 31.
Useless.

Not Working on mozilla version-26 browser Ohodnoceno 1 z 5 hvězdiček

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