Moonlight is an open source implementation of Silverlight (http://silverlight.net), primarily for Linux and other Unix/X11 based operating systems. In September of 2007, Microsoft and Novell announced a technical collaboration that includes access to Microsoft's test suites for Silverlight and the distribution of a Media Pack for Linux users that will contain licensed media codecs for video and audio.

More information may be found at: http://www.mono-project.com/Moonlight

Moonlight-Plugin-Mozilla Bug Tracker: https://bugzilla.novell.com/index.cgi