clipped from: mashable.com 
Fire.fm – Fire.fm was the winner of the Extend Firefox 3 contest, and with good reason. It gives you full access to the Last.fm library from anywhere you may surf to. Discover new artists, play favorite tracks, explore people with similar music tastes and more.
Online Music Player – This music player installs down in your status bar and allows you to play MP3 files either from the web or from local files. It is also capable of displaying lyrics and managing playlists.
