Smooth Slider problems on Firefox

I set up a 3 photo slide under the Header and Menu using Smooth Slider Plug in. It is working fine on all browsers except Firefox. The website is https://www.amsat-intl.com, it is on the home page. When I open it in FireFox it moves it away from the content to the right. You need to scroll right to see it. Can anyone help me try to find a solution. Thank you.