Web designers/web masters should be aware of this serious bug with Top Navidation Bar III and firefox browsers. The bug is that each time you mouse over a menu item in a TopMenu III menu bar it sends two page reload commands to to the server. So, for example, if a pull down menu has ten items and you want to select the last one (ie you mouse over 9 items) then it will send 18 reload commands to the server. This only happens with Firefox (I'm using the latest version), not with IE. It happens even if you don't select an item. Just mousing over the menu items sends multiple reload commands.
I noticed this when I saw my modem lights flashing each time I moused over menu items. This is strange -- simply mousing over menu items should not transmit anything over the network. I then monitored it at the server and confirmed it. It's potentially very serious if you are using server-side scripts and processes (asp, CGI etc) as they get called each time you mouse over a menu item.
You can see this for yourself by using the demo menu at the top of the TopMenu III page on this web site. Use dial-up and watch your modem lights. If you look at your sever logs you will see a whole pile of new log entries each time you mouse over a menu item. You should see none.
I have emailed the developer several times over the past few days but haven't received a response as yet.