The plot thickens. I hadn't thought about the buttons being drop down menus instead of links, which would explain why they didn't behave like links. On my computer, the buttons do not work at all with FF but do work with IE. However, IE blocked the embedded links and gave me the option to unblock it. Don't know if the behavior is different today than when I looked before or whether I previously just stopped looking when FF did not work at all and the buttons did not behave like links in IE.
There is nothing wrong with your computer. If there was, you would be having trouble with most web sites. This web site is just not well-behaved. It appears that the programming for this web site is extremely particular about the browsers...