CSS Changes Fix IE Display but not FF

I have changed the css as suggested in the forums so that featured products, specials, etc. display correctly on the home page and it works in IE but not FF.
Can anyone help me determine what else needs fixing? I am trying to display two columns per row.
My url is: https://www.starvingartistsfurniture.com

Thanks

I would submit that Firefox is probably doing what it's told while IE is (for once) screwing up correctly.
One can often get in trouble by mixing percentage widths with padding, margins, etc. in pixels.
You might want to address your problem with the csstemplateheaven folks. If they say that IE is rendering the site correctly, we can show them MANY instances where you have to do a workaround to get IE rendering correctly.
Your template (as unfortunately many purchased ones do) has a mixture of css and imbedded spans/styles. Makes it very difficult to identify the problem.
Let us know what csstemplateheaven has to say.
Interesting that the stylesheet says it is Clean Business while your site is using Red Passion...