Browser issues

Hi guys,
I have some browser issues with my slider which you find on
http://www.greenpartnerships.eu/

IE (11.09…) works correctly

Firefox (29.01) doesn’t show the slider images, even though they appear to slide correctly (basing on dots movement);

Chrome (35.019…) works correctly except for the first slide, which stands still; as I step manually to the next slide, it starts working correctly by its own.

Any idea?
thank you!
M.Salvi

https://wordpress.org/plugins/slider-image/