Slider on homepage: not working on Firefox

I am using Your Shop template since two years almost, and I am very satisfied with it.
But one or two weeks ago, an issue has appeared: the slider (Gavick Photoslide GK3) on the homepage has stopped working, using Firefox, as you can see on the homepage of the website: www.mimesisedizioni.it

Still it works with IE, Chrome or Safari instead.
I don't have an idea for how to fix this problem. Can somebody help?

thanks a lot, best regards

Hi,

Please try to disable the "System - MooTools Upgrade" plugin.

Hi, I've followed your advice and it works now!
Thank you a lot