Works pretty good on Linux!

[ihateSELinux]

I'm testing with the 3.0 test branch and it works great upon making two changes to buttons.css:

As is, there is no alignment for maximized windows, leading to the buttons being vertically misaligned by one pixel when maximized; and the margin-top value for non-maximized windows is +1, which ends up vertically misaligning the buttons by two pixels.

Thus:

		#main-window[sizemode="normal"] {

			.titlebar-close,
			.titlebar-max,
			.titlebar-min,
			.titlebar-restore {
				margin-top: -1px !important;
			}
		}

		#main-window[sizemode="maximized"] {
			.titlebar-close,
			.titlebar-max,
			.titlebar-min,
			.titlebar-restore {
				margin-top: -1px !important;
			}
		}

This results in: