For years I could not understand why somebody decided to move the menu below tabs in Mozilla. In Firefox there's a setting, which can set it right again. But in Thunderbird it was a nightmare... Finally I found this add on and my life is nice and easy again!
Thank you, Axel, Great job.
I had some problems with configuration, but your intensive help made me hapy during just few hours... And, by the way, If I would play a bit with the settings myself, it could probably go faster.
it is always good to see when users go to the support site: http://quickfolders.mozdev.org/menuOnTop.html
to contact me and resolve issues as they arise. It appears that selecting a flavor from the top fixed the issue, so we will keep that in mind for the future.