Here's another endorsement for Firefox! I highly recommend it for all sites. I am working night and day on a redesign for KH which *should* be unveiled next month in time for the new season. There are a lot of technological improvements (web 2.0 features) in the new design which Firefox handles beautifully. IE, however, has me pulling my hair out with problem after problem. Nothing too major, just quirky behaviors that require extra coding to remedy. So the more people using Firefox the better.
Currently about 27% of our visitors use Firefox, and 65% use Internet Explorer and the rest Safari, Opera, etc. Hopefully after this thread the IE percentage will plummet!