Foxytunes included these in the last update but CuteMenus - Crystal SVG replaces these, now they show when you choose the player.
Install options
Install Stylish for Firefox, Thunderbird, Flock, Mozilla Suite, SeaMonkey, or Songbird. If you have Stylish already, make sure you're using the latest version and have JavaScript enabled.
You need Firefox with Stylish to use this style. Get it now, then Install Stylish, then come back here to install this style.
- load into the Stylish extension where you can preview and save it.
- this style has been updated since you installed it in Stylish.