Not working in Firefox

Hey guys, awesome plugin and very useful. Thank you for offering it free to this awesome community :)

I’m using it on a website and it works fine in Chrome, however Firefox just points me straight to the image file in the browser. Here’s what I’m working with:

http://www.riversedgefishing.com/gallery/

I’ve noticed it on other sites that use your script as well, however your demo works fine in Firefox. Tearing out my hair here. What is going on?

Thanks for any help you can give :)