It told me to upgrade to firefox 3 even though I was using firefox 3 and even though everything would load fine after the warning message I had to click through every time, with the upgrade which basically just made fonts larger and used more screen space for colored bars and etc, it disabled the ability to type the message part of emails. Changing the vendor name directly to "Firefox" allows me to type messages, but I still get the upgrade to firefox (OR INTERNET EXPLORER IS WHAT YOU REALLY WANT) messages 1 out of 10 times.