firefox plugin

Recently, I wanted to learn how to make firefox plugin.To do that,  I followed the official firefox tutorials: https://developer.mozilla.org/en-US/Add-ons/Overlay_Extensions/XUL_School
I was simple and quicly I obtain a result.
So, if you want to see from curiosity a firefox plugin, you can see my GitHub project : https://github.com/drieu/checker.