[Plugin: NextGEN Gallery] Slideshow not showing in Firefox

I’m able to view my slideshow in all browsers except Firefox on a Mac?! Even if I try to view this example page http://nextgen-gallery.com/slideshow/ the slideshow doesn’t show up.

This was fine up until the other day so I’m slightly perplexed as to what may have caused it. Any help would be really appreciated.

I’m running the latest versions of everything including Firefox.

http://wordpress.org/extend/plugins/nextgen-gallery/