• A user interface markup language developed by Mozilla. XUL is an XML dialect for writing graphical user interfaces, enabling developers to write user interface elements in a manner similar to web pages. XUL applications rely on the Mozilla code base or a fork of it. The most prominent example is the Firefox web browser. However, Mozilla has reduced the usage of XUL in Firefox after their rewrite of the browser engine in version 57. ← Wikipedia

1. Previous term: XML Schema Definition
2. Next term: XML-RPC
3. Random term: Tracking pixel