In a firefox theme, how do I change the default background color of a window?

Searching in the Mozilla classic.jar, I found a dialog.css (at ../classic/global/dialog.css), but no window.css nither panel.css.

So, where am I suppose to chan开发者_如何学编程ge the default background-color of a window in my theme?

Obs. I mean not only the main browser window, but any window that opens with no specified background-color, I want to change the default color.

The CSS for the window is in global.css which I already linked you to in another answer. The CSS for a panel is in popup.css.