Hope this can be fixed soon..
That seems weird, because I have not had an issue with FF 3.5.7.
FF is my prefered browser, and no problems with it so far on my site.
I paid it to use in my own custom template but I find it no use. Because:
1) Have bugs in the module. If use in RT template no problem because of template override. I guess they never test it in non-RT template. One bug is about a spelling error in its code.
2) If you set fixed menu item width, you will run into alignment problem. And there is no documentation or parameter you can fix the problem.
3) Extra parameters can only be found in RT templates. But these parameters are important to do customization.
4) No support in the forums for non-RT users.
In conclusion, I wonder why this module is open to be sold to public. If you do not use RT-templates, this module is of "NO USE". Unless you just need a default setting. But in that case, you can use many free tools.