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Just what I needed, but full permission is asked. Temporary work-around is to deactivate the add-on after reordering.

Tato recenze je pro předchozí verzi doplňku (2.1.1). 

I think many other add-ons are the same.
Add-ons published on addons.thunderbird.net (ATN) have passed human review.
In addition, the source code of this add-on is open, and anyone can check it.