From the website (http://www.apple.com/live/) : "Live streaming video requires Safari 5.1.10 or later on OS X v10.6.8 or later; Safari on iOS 6.0 or later. Streaming via Apple TV requires second- or third-generation Apple TV with software 5.0.2 or later."
oh..... So I guess I won't be watching it. Firefox on Windows @ work