Themes

Themes: The overall look and feel of an application.

Netscape Theme Reference (XULBook.com)
Creating a Skin for Mozilla (EightLines) - How to create a skin for Mozilla and maintain it
Creating Themes for Mozilla and Netscape (IBM developerWorks)
Hewitt's Theme Style Guide
Building a Thunderbird Theme
How to Change Your Look With Mozilla Skins (O'Reilly Network)
Theme Tools (Design4Use.net) - ThemeAlbum, ThemeWrap, and JarInfo for Netscape 6.1

Mozilla