Logos do not appear in Firefox

First, thank you for a beautiful plugin. It looks clean and professional. However, it has just been drawn to our attention that the logos are not displaying in Firefox, although we can see the controls. It displays fine on Chrome, IE, and Safari, including mobile.

You can find this toward the bottom our home page at http://www.coreography.com or view an image that shows the display on chrome and firefox at http://www.coreography.com/wp-media/kiwi-carousel-firefox-display.png

https://wordpress.org/plugins/kiwi-logo-carousel/