Hi guys,sorry to hear its not working for you. I did testing and was pretty sure the special characters issue was fixed? On my test site characters of all sorts work fine in all browsers. Looks like I'll have to do some more extensive on that issue!
The plugin works fine for 10,000+ users in all browsers, so it's most likely something isolated to your site that's causing it to malfunction in firefox. You need to check all the configuration, and do the other usual stuff - try with other plugins turned off, try with a different theme, try with different filepaths etc... If that does not help you isolate the error, it's a good chance there's a jQuery or other coding error/conflict... so run a debugger to isolate the problem and post the findings here so I can look into it and fix it.
Sorry I can't just give a simple 'oh not playing in ff? well then its definitely xyz'.... it's just not that easy sorry. :-(