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Chapter 16. Writing an Extension > Understanding XML User Interface Language

Understanding XML User Interface Language

Firefox makes extensive use of XUL. In the previous section, “Extension Developer,” the effect of a simple XUL fragment was shown. Of course, that example is not a full application, but it does show what XUL can do.

XUL Syntax

XML User Interface Language (XUL), which is based on XML, has a syntax that at first glance seems similar to HTML. This syntax is made up of events, widgets, tags, and data. There are some rules that are global and must be followed. Four basic rules are


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