XUL

Let me get this straight: XUL is Mozilla's cross-platform application development framework. You get to use XML, CSS, and JavaScript for the front end GUI stuff and plain C/C++ for the application logic. Some notable XUL apps are Thunderbird, and its commercial fork, Postbox. Why is it not more popular /prog/?

Hating on XML and CSS is retarded. These aren't even languages. They're incredibly simple tools that do their jobs.