i haven't found any issues under firefox, sorry.
i anyone knows any issue - plz, report something specific, to be sure that there's some, but not user-specific issue!
regarding the module - i found very usefull and pretty.
the only concerning is about positioning - by default it is positioned at the top of the content, and to move it on the bottom, on ehave to fix it in the code. actually i can't change the position at the "mambots" tab, as i expected, so the votes are positioned after the comments, which is not good :(
anothe clue to abyone, who want to use it - if you will allow votes only to registered users - make sure to keep the second bot "tools" registered as for public! without this it didnt work for me!
and for translations you have to manually change the jcvoteutils\jcvoteutils\rpc.php file at the bottom.
i rate it exellent!