The XUL Tutorial was created by Neil Deakin Last updated on June 3, 2020 Welcome to the XUL tutorial. This tutorial describes XUL, the XML User-interface Language. This language was created for the Mozilla application and is used to define its user interface. This tutorial describes XUL as it is used in Mozilla 1.7 and Firefox 1.0. 1. Introduction 1.1 Introduction 1.2 XUL Structure 1.3 The Chrome