First off, an example. This is Windows Explorer:
I have marked what I call "the content border" in red here:
Firefox has not got this border. Since I wanted Firefox to look more like other windows, I added them using CSS. That's easy. The hard part is to find the correct colors. After (way too) much investigation, I found that rgba(10%,10%,10%,.65) is almost perfect for the inner, darker color of the content border, and that rgba(255,255,255,.56) is almost perfect for the outer, lighter color of the content border. (If anyone finds better colors, please tell me.)
Now I want to do a similar thing: I'm trying to style a button (that is placed on a glassed background) in Firefox like the Minimize and Maximize buttons, ie those shown here, to the left of the Exit button:
So it's a matter of changing my button's background, borders and perhaps box-shadow. That's easy. The hard part is of course to find the correct colors. Since you seem to know quite much about Windows themes, I thought that perhaps you could find these colors easily? I mean, when you replied to my first post, you understood that "They are Reflectors in the aero.msstyles." Perhaps you understand the what I'm talking about now are "Window-button-style in the aero.msstyles" or something? It was just a thought ...
Thanks again. And ask again if it's still unclear