xpi/content/css/alttabstoolbar.css
@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);

@-moz-document url(chrome://browser/content/browser.xul) {

	@media all and (-moz-windows-theme:aero) {
		#main-window[defaultfxtheme="true"][tabsontop="false"] #navigator-toolbox #TabsToolbar:not(:-moz-lwtheme){
		  background: linear-gradient(to bottom,#aabccf 1px, #ffffff 1px,#d0d7ec,#e9ecfa) !important;
		}
		#main-window[defaultfxtheme="true"]:not([tabsontop="false"])[sizemode="normal"] #navigator-toolbox #TabsToolbar:not(:-moz-lwtheme){
		  background: #dbeaf9 !important;
		}
	}
	@media not all and (-moz-windows-theme:aero) {
		#main-window[defaultfxtheme="true"][tabsontop="false"] #navigator-toolbox #TabsToolbar:not(:-moz-lwtheme){
		  background: linear-gradient(to bottom,#808080 1px, #ffffff 1px,-moz-Dialog,-moz-Dialog) !important;
		}
		#main-window[defaultfxtheme="true"]:not([tabsontop="false"])[sizemode="normal"] #navigator-toolbox #TabsToolbar:not(:-moz-lwtheme){
		  background: -moz-Dialog !important;
		}
	}
	/* Win8*/
	@media all and (-moz-windows-compositor) {
	  @media not all and (-moz-windows-glass) {
		#main-window[defaultfxtheme="true"][tabsontop="false"] #navigator-toolbox #TabsToolbar:not(:-moz-lwtheme){
		  background: linear-gradient(to bottom,#a0a0a0 1px, #ffffff 1px,-moz-Dialog,-moz-Dialog) !important;
		}
		#main-window[defaultfxtheme="true"]:not([tabsontop="false"])[sizemode="normal"] #navigator-toolbox #TabsToolbar:not(:-moz-lwtheme){
		  background: -moz-Dialog !important;
		}
		#main-window[defaultfxtheme="true"] #titlebar-buttonbox {
			-moz-margin-end:-5px !important;
		}
	  }
	}

}