Christmas Browser 99 was a festive, holiday‑themed web browser for Windows 95/98/NT, built on top of Internet Explorer 4. It featured falling snow, MIDI Christmas music, draggable icon shortcuts, and a string‑light‑style browsing history. Microsoft Agent characters like Merlin added spoken feedback and playful personality to the experience.

Maximized Software, the developer behind it, operated from the mid‑1990s through at least 2010. Christmas Browser 99 followed earlier releases (’96 and ’97) and used a $20 shareware model that unlocked extra icons, backgrounds, and songs while supporting future updates.