I created a simple Firefox addon with the Add-on-SDK that changes a configvalue: https://github.com/rubo77/devPixelsPerPx-Toggle
This addon works fine on Firefox, but I would like it to work for Thunderbird too.
What are the differences between an add-on for firefox and an add-on for Thunderbird?
Or do I have to use another SDK when I want to develop a Thunderbird add-on?