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Mozilla Add-ons

Thunderbird Add-ons at is great way to start browsing Thunderbird extensions.

Writing An Extension

See the Mozilla Developer Center for help with writing extensions. There is a list of links to helpful development tools. The Thunderbird page has a tutorial, some examples, and links to other sites with resources for Thunderbird extension developers.

Better extension APIs

New APIs are planned at the Thunderbird:Extensions:Needed_APIs page.


STEEL, by jminta, stands for a proposed Scriptable Thunderbird Easy Extension Library, a FUEL-like set of interfaces to facilitate Thunderbird extension development.