Getting started on thunderbird extensions
I have been using Thunderbird for many years now and now I am interested in developing some of my own extensions. I looked over the documentation on their official website but found little support for getting started at this. I have some experience with python, perl, php and would like if you can recommend me some getting started materials, a "hello world" for this would be great.
Answer
Update 2020
As of 2020, here is the current documentation:
https://developer.thunderbird.net/add-ons/about-add-ons
To build a simple Thunderbird extension in ten minutes look at this tutorial:
https://developer.mozilla.org/en/Extensions/Thunderbird/Building_a_Thunderbird_extension
However, the really good tutorial that focuses on creating Mozilla extensions (both Firefox and Thunderbird) is here:
https://developer.mozilla.org/en/XUL_School
Advanced topics about Thunderbird extensions:
https://developer.mozilla.org/en/Extensions/Thunderbird/HowTos
Some additional info:
https://developer.mozilla.org/en/Extensions/Thunderbird