Further to my post on the other forum about the layout getting scrambled in Firefox. If I reset the minimum font size in the options to 10 point everything is fine. If I set it higher (my usual practice) then any section with a large body of text disappears entirely - eg you can't see any of the info on Aquavox unless you have a low min text size otherwise the "featured" products" window moves from the right side to just beside the left column and the large middle column with all the info and the download links disappears completely.
Your page layout scheme seems to depend on the text size - it doesn't allow the text to flow inside a constant size frame. I browse the web a lot and only a few sites will not tolerate the larger min text size which I use for better legibility.