Bewertet mit 5 von 5 Sternen

What I also found out is, that if you add a Lable to a specific e-mail (e. g label "private"), then normally after selecting that e-mail in the treadpane its whole line is highlighted with the color of its label (e. g. red).
However with account colors installed, the labled e-mail (line) in the thread pane is always blue when selected (as any other e-mail).

Diese Bewertung wurde für eine vorherige Version des Add-ons (3.2) abgegeben. 

This is resolved in Version 3.3 which works with Thunderbird 3.1.