This article gives suggestions on how to set up your Mozilla application for extension development. Unless otherwise specified, these suggestions apply to both Firefox and Thunderbird as well as SeaMonkey version 2.0 and above.
developer.mozilla.org/en/Setting_up_extension_development_environment
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Ever since we started releasing home-brewed Firefox extensions here at Lifehacker, several readers have asked: How difficult is it to build a Firefox extension? For someone with a bit of programming experience, the answer is not that diff...
www.lifehacker.com/software/programming/how-to-build-a-firefox-extension-264490.php
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Create extensions that go beyond the built-in capabilities of Web browsers. The Mozilla project's XUL engine is a user-interface language that you can use to extend Mozilla browsers, or to build stand-alone applications. XUL is a surprising...
www.ibm.com/developerworks/web/library/wa-xul1/
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