I'm using FireFox 1.5.0.7 on Windows XP Professional Service Pack 2. I am using the default font settings.
I think that my initial post exaggerated the problem and may have caused some confusion - sorry! When I said that the headers are "huge", I should have said, "too big". I'm trying to whip up the AA wiki into shape and right now from a visual standpoint, the headers take up too much space. Compare the Wiki headers to what is shown on
http://en.wikipedia.org/wiki/American_Airlines. The headers are a smaller size and even have a nice dividing line beneath them. It would be great if we could have a similar look on our wiki.