Rated 4 out of 5 stars

This add-on works perfectly on English version of FireFox, but when I chaneged it to Persian, which is right to left, the msg's do not display properly

This review is for a previous version of the add-on (1.4). 

Thanks for the feedback. I filed a bug for this on the Cheevos issue tracker at https://github.com/msujaws/Cheevos/issues/21 to get this fixed.