Menu behaving badly on Firefox

The menu looks fine on Safari (I am a mac user) but when I load the page on Firefox, the first menu item takes up the whole first line, is right justified, and causes all the remaining menu items to show up on a new line. This totally screw up the layout. I've tried having only 1 menu item and it still shows up right justified. If I ad a 2nd item, it wraps to the next line.

Ironically, it looks fine on safari. I attached 2 screen shots. The first is Firefox and the second is Safari. You can also look at the site directly at http://www.karateorlando.com

I also need the menu to support "drop down" when there is a child entry, but first thing first.

Thanks! Love the theme.

John