Windows Media Player for Firefox
Windows Media Player now works inside Firefox 2.0, officially.

Microsoft today released an official Windows Media Player add-on for Firefox that will let you play wmv video, wma audio and other streaming media formats inside Firefox without problems.

The Firefox plug-in is backwards compatible with Windows Media Player version 6.4 and also adds support for Windows OCX scripting interfaces, which allows developers to add more functionality to applications.

Download Firefox Plugin [for XP SP2 and Vista, 300k]

Port25 on TechNet.com [via]

Yesterday - Adobe Media Player for Flash Video.