Get GTK+ programs respect KDE font settings [Solved]

[Ryuno-Ki]

Hey there,
some problem, I could fix yesterday:
If you like a dark themed KDE Plasma setup (like me), you may be annoyed of GTK+ programs such as Firefox, Thunderbird, LibreOffice, GIMP, … too, which don't respect your Font settings (color and so on) - even if you set it so in System Settings!
Here is the solution: Remove/Rename all .gtk*-files in your $HOME. You may have to restart the applications.

Regards, Ryuno-Ki