Working version for FF4/5 Ohodnoceno 5 z 5 hvězdiček

I had the same problem starting with Firefox 5.

The problem arises from the missing "chrome.manifest" - I created one, increased the version to 0.5.5 and set it to be compatible with up to Firefox 5.*:

Original/English version: http://ul.to/7x9atjam
German version: http://ul.to/085cxzjd (thanks to http://www.erweiterungen.de)

THANKS to Jeremy!