Firfox does not render full width

Hi Sakin, I did a little modification to the width of the content area (reduced it to 600px) and now Firefox will only render at maximum 998px width even at window sizez of 1400px or more. It also seems to render at reduced size (90% or so) in the smaller responsive dimensions. The effect is that the side bar is pushed to the bottom-right of the page, as it would on a smaller screen. It works fine on Chrome and IE, so i dont understand the issue. Hope you can help. www.e-kapedani.com Thanks