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MDN - MDC
Building an Extension - MDC
XUL - MDC
XUL Tutorial A guided tutorial that will help you get started with XUL, originally from XULPlanet. XUL (XML User Interface Language) is Mozilla's XML -based language that lets you build feature-rich cross platform applications that can run connected or disconnected from the Internet. These applications are easily customized with alternative text, graphics and layout so they can be readily branded or localized for various markets.This content covers features introduced in Firefox 2 . Firefox 2 supports the OpenSearch description format for search plugins. Plugins that use the OpenSearch description syntax are compatible with IE 7 and Firefox. Because of this, they are the recommended format for use on the web. Firefox also supports additional search capabilities not included in the OpenSearch description syntax , such as search suggestions and the SearchForm element.
Creating OpenSearch plugins for Firefox - MDC
Reposted with permission from Robert Nyman : Admit that you have always wanted to know how to develop a Firefox extension but never had the time to learn. Here I will walk you through and at the end of the article we will have created a fully functional Firefox extension!
How to develop a Firefox extension « Mozilla Add-ons Blog
From MozillaZine Knowledge Base Two major extension developers' features introduced in Firefox 1.5 were the greatly simplified chrome registration scheme and the reworked Extension Manager . These changes make it even easier to start writing extensions.

