An add-on to create Thunderbird calendars that dynamically contain the birthdays stored in address book(s). You can download stable releases through addons.thunderbird.net. Alternatively, binary builds for named versions are also available on the releases page of this repository.
This add-on is using an experiment based on the upcoming Calendar API, but is otherwise a pure WebExtension. Please note that the bundled experiment in this repository may not contain the latest changes of the official API draft. If you want to create your own add-on using the Calendar API, you should consider to start with the latest official version.
On a system with common unix tools installed, you can use make to create an xpi archive containing the add-on in the dist folder.
Alternatively, you can directly use the add-on from the src folder or pack that folder into an xpi yourself.