Related Products not displaying properly on Firefox Browser

Hi there,

On a product-page, the related products at the bottom display 3 products on one line and then the fourth product is displayed on a new line when using the Firefox browser.

See this page-link: http://dbo.co.za/product/patient-ninja/

How can I get all products to display on one line as what happens when using the Chrome browser?

 

Hello,

Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

.productlisting .pgallery ul.thumbnail li, ul.thumbnail li{
width:200px;
} 

Thanks & Regards
Gourav Shrivastava