I thought I’d bring a Firefox addon called Prism that works great as an adjunct to FirePlay to your attention. You open any web page, such as your Fireplay library, and Prism turns it into a web app that has its own icon on your desktop, or quick launch area. The icon loads the page without opening Firefox and has no menus, toolbars, navigation buttons, status line, etc. You no longer have the problem of absent-mindedly closing your browser and having your music quit playing or having a webpage close or commandeer the tab FirePlay’s in.
https://addons.mozilla.org/en-US/firefox/addon/6665 for Firefox 3
There’s also a version of Prism that runs as a standalone app instead of as a Firefox addon that works with older Firefox versions.