This is a basic example of how to make a Thunderbird add-on. This repo is the result of tutorial.
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Thunderbird, version 35 to 49.0
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makeor a tool to zip a folder
Build your add-on
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on unix systems simply run
make -
on windows compress the folder using zip (excluding,
.git) into<your add-on name>.xpi
To install it into Thunderbird open the Add-ons page in Thunderbird and
drag-and-drop the .xpi into the window.
Congrats, if everything went right you should need to restart Thunderbird to complete the installation and have a date in the bottom right of the status bar.