Firefox 13 all dropdown menus are showing

Hi,
I have a weird effect with Firefox 13, and only with the version 13+, and only on an online web site (still under construction): all the dropdown menus are showing, see the first image:


Firebug says "DropdownMaxMenu is not definded", but the Script is definitely definded.

the strange thing, it worked until Firefox 12, and it still works withe the same web site locally with Firefox 13...

Has any one an idea?

Hi
please give me you url
Ced

Here the URL

www.atelier-gartengestaltung.ch/joomla/

Thanks!

I have firefox 13, and no issue !
No error in the page and the menu is working well
Ced

Ok, maybe it is an add-on that makes a problem!

Thanks for looking!

Cheers, Pierre