Documentation & Resources
A collection of the most important developer resources outside of developer.thunderbird.net.
MailExtension Development
A few helpful resources relevant for developing add-ons for Thunderbird.
The official Thunderbird add-on repository.
A list of all supported values, which can be used as strict_min_version and strict_max_version values in add-on manifest files.
A guide from the extension workshop with the most recent information on debugging add-ons. It is written for Mozilla Firefox but applies for Thunderbird as well.
A guide how to use Visual Studio Code to debug Thunderbird extension.
WebExtension API Documentation for Thunderbird
Documentation of all WebExtension APIs supported by Thunderbird.
A collection of explanatory WebExtension examples for Thunderbird.
A collection of WebExtension examples for Firefox and other browsers. They probably won’t work directly in Thunderbird, but they may provide hints on how to use some of the WebExtension APIs that Thunderbird inherited from Firefox.
The WebExtension support repository provides additional tools, scripts, custom elements, Experiment APIs and other resources, to simplify the development of WebExtensions for Thunderbird.
Central bug tracking for Mozilla projects. Some useful pages related to Thunderbird:
The main documentation for Mozilla developers. As Thunderbird is based on the Mozilla platform, some Mozilla documentation is valid for Thunderbird as well. Useful MDN pages on WebExtension are:
Experiment Development
Useful resources for converting legacy extensions or for creating Experiments.
The current Firefox code documentation, which might be needed when converting legacy extensions.
The archived Mozilla documentation includes information about internal components and functions used by legacy extensions. Please be aware, that those pages are not maintained and are potentially outdated. Some useful direct links:
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