Yupz, that's true!
The text glow is also not there. Your map is only provides the older version of firefox background image location.
So my 2 methods to get rid of that text glow didn't work. The only other place there is a text glow is Windows and Caption Buttons > Aero > Dwm Window > Glows > Text. Maybe that is it. Otherwise I would just go through the msstyles and eliminate all glow properties until I found the right one.
Yeah the new Beta is different but most of the background is Fonts & System Metrics > BtnFace:Color