1. XUL XML User Interface Language

2. XUL Firefox’s user interface is in XUL and JavaScript XUL is a XML grammar to add/modify UI widgets of the browser. User actions are bound to functionality using JavaScript.

3. XUL Overlays Overlays attach other UI widgets to XUL documents at run time. XUL fragments are inserted at specific merge points in the master document. For example: “status-bar” is the merge point and “my- panel” is the new XUL fragment

4. Chrome URI’s XUL files are loaded via chrome URI’s chrome:// / / The chrome URI has three parts: Package name : Given by user Type of data : Content or Skin or Locale Content : xul and js files Skin : images and css files Locale : DTD and.properties files File name : Path of the file to load

5. Chrome URI’s… Chrome URIs are written in chrome.manifest file Overlays/skin/stylesheets are registered in chrome.manifest file overlay chrome://browser/content/browser.xul chrome://sample/content/sample.xul

6. XUL file