Firefox 5 beta has been released, and the Firefox 5 system requirements page shows Windows 2000 as an officially supported operating system.
I'm also not having any problems with Windows 2000 and Flash on my test system.
Firefox 5 System Requirements
Looking for great gifts under $100?
Trendy tech gifts don't require a hefty price tag. Choose from these CNET-recommended useful and high-quality gadgets.