Read More/Source: ExtremeTech
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Firefox is not only a fine web browser, but the code it's based on is a standardized open-source framework that other applications can use take as a basis, using XUL—eXtensible user-interface language (pronounced ZOOL). XUL apps work across platforms and can either be internet-connected or standalone.
Today we'll take a look at one of the most appealing XUL apps—Songbird, from Pioneers of the Inevitable, Inc, which claims folks who've previously worked on Winamp and Yahoo! Music Engine. Songbird is currently just at version 0.2, so consider this a preview rather than a review of the fully baked product. Songbird is a "mashup" of a web browser and a desktop media player. Think of it as the open-source analog of Windows Media Player or iTunes. Like Winamp, Songbird supports skins, which are called "feathers" in this case. It runs on Windows, Linux, and Mac OS.