ITRO doesn't work on firefox

Hi support

my popup can work on chrome, IE but not on Firefox.
Here is the link http://blog.marketing4restaurants.com/a-great-journey-with-the-degustation-menu-at-esquire-in-brisbane/

Here is the setting.
All pages

Popup seconds 30
Popup delay 30
Next visualization(hours) 0

Any quick reply will be very appreciated.
I updated the latest version just then

Regards
Roy

http://wordpress.org/plugins/itro-popup/