Here are 3 patches intended to be applied to:
QtCurve-Gtk2-1.8.12

1:shadowhelper.patch
http://pastebin.com/eCMQfMZf

2:qt_settings_A.patch
http://pastebin.com/txuqdLf6

3:qt_settings_B.patch
http://pastebin.com/YTEDqdgq

By applying 1:shadowhelper.patch you get:
Good: Remove ugly shadow under firefox tooltip icon
(when you use autoscroll)
Bad: Remove shadows under Firefox Url box too

By applying 2:qt_settings_A.patch you get:
*Good: Paint back picture on firefox window decoration
too so that you can use personas to match it.
*Bad: if you don't use personas...
*Good: Makes GTK menu squared to fix ugly shadows in
gtk apps when using xrender compositing
*Bad: There's no need to use squared menus
with opengl compositing

By applying 3:qt_settings_B.patch you get:
*Good: Paint back picture on firefox window decoration
too so that you can use personas to match it.
*Bad: if you don't use personas...