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I've managed to customize Thunderbird to better fit my KDE theme using the browser toolbox as guide. However, the toolbox doesn't work for the new message window. I can't find out how to change the default background color there. I would appreciate If anyone could point me in the right direction. The screenshot shows the part I'm trying to modify.
Here is another picture showing Dolphin with the "correct" background color and the new event window, which also has the same color I'm trying to change in the new message window