Lack of Transparency / detail / doc Rated 1 out of 5 stars

I miss a word or two on the add-on in detail - where has this functionality been in the last ten years and why is it not part of mozilla core? Where is Mozilla Sync for Thunderbird??
Ich schließe mich dem Vorredner an:
Warum so wenige Worte über das Add-On?
Wo bleibt endlich Sync for Thunderbird?