It says it should show something different everyday - 'guess we'll see:
> http://www.computerhistory.org/tdih/
"November 9, 2004
Firefox 1.0 Introduced
Sometimes abbreviated as FF, Firefox was Mozilla's next generation browser and included such features as tabbed browsing and popup blocking. Mozilla Firefox became a popular alternative for Microsoft Internet Explorer users who sought alternatives that could prevent spyware as well as a host of other Firefox features."