This isnt aything to do with Firefox but its made by Mozilla, I put it here as its Win/Mac/Linux and a few more people might notice it.

This is Songbird, Mozillas answer to iTunes. As its made by the FF people its supposed to be extensible so could be some interesting stuff come out for it if it takes off.

Songbird - Open Source Music Player

System specs are as below

System Requirements

Windows

  • Windows XP SP2, Windows Vista
  • 1.5 GHz Pentium 4 or comparable
  • At least 512 MB of physical RAM
  • At least 150 MB of available space on your hard drive
  • 16 bit sound card (Recommended: 32 bit Sound Card)
  • Speakers or headphones
Mac

  • Mac OS X 10.5 or later
  • Macintosh computer with an Intel x86 processor
  • At least 512 MB of physical RAM
  • At least 200 MB of available space on your hard drive
Linux

The Songbird QA team tests Songbird on Ubuntu 8.04 32-bit and 64-bit, and Fedora 9 32-bit.
  • glibc 2.3.4 or later
  • XOrg 1.0 or later
  • gtk+2.10 or later
  • fontconfig (also known as xft)
  • libstdc++6
  • 1.5 GHz Pentium 4 or comparable
  • At least 512 MB of physical RAM
  • At least 200 MB of available space on your hard drive
  • 16 bit sound card (Recommended: 32-bit Sound Card)
  • Speakers or headphones

I cant try this on my comp as its 10.5 only which is a bit disappointing. If anyone uses it let me know if its any good/bad.