I would ditch the google ads, they do nothing to make your site appealing.
I know, I know, but they make me money. Maybe programmers don't like them but your average customer doesn't give a stuff, the portals are plastered in ads. Hold down CTRL and scroll the wheel. Watch all the content disappear off screen until only a cut in half menu remains.
This totally doesn't occur for me, all that happens is the font size on the menu changes. what browser please? 1920x1200 on my laptop, 1380x720 on the real computer.
well that explains a lot. Not exactly normal resolutions for customers. Lots of other sites must look similar i.e. lots of whitespace. In Firefox it screws up royally.
Testing in Firefox is on my to do list. As for how to fix any firefox problems, I really won't have a clue as my web programming skills are next to 0.