It requires a fair bit of knowledge of a strange mix of technologies: RDF (Resource Description Framework), XUL (XML User Interface Language), XPI (Cross-Platform Installer), XPConnect, XPCOM (Cross-Platform Component Object Model), DOM (Document Object Model), JavaScript and CSS (Cascading Style Sheets).
Unfortunately, developing a Mozilla Firefox extension is far from easy. This hackable nature of Firefox is something that Mark Surman of the Mozilla Foundation has emphasized countless times, for example in his keynote at FOSDEM 2009 a few months ago: only the ability to extend the web makes it truly the user's web. Many users just keep Firefox as their default browser because they can't live without specific extensions that don't exist in other browsers. Over 12,000 enhancements for the browser are available, varying from additions of simple features to complete applications such as IRC or FTP clients. One of the great strengths of Firefox is its extensions ecosystem. This article was contributed by Koen Vervloesem
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