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

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

	#main-window[tabsintitlebar][sizemode="normal"]:not([tabsontop="false"]):not([customizing]):not([fx47plus="true"]) #TabsToolbar {
	  margin-top: -6px !important;
	}
	#main-window[tabsintitlebar]:not([sizemode="normal"]):not([tabsontop="false"]):not([customizing]):not([fx47plus="true"]) #TabsToolbar {
	  margin-top: -10px !important;
	}
	
	/* Firefox 47 +*/
	#main-window[tabsintitlebar][sizemode="normal"]:not([tabsontop="false"]):not([customizing])[fx47plus="true"] #TabsToolbar,
	#main-window[tabsintitlebar]:not([sizemode="normal"]):not([tabsontop="false"]):not([customizing])[fx47plus="true"] #TabsToolbar {
	  margin-top: -10px !important;
	}
	#main-window[tabsintitlebar][sizemode="normal"]:not([tabsontop="false"]):not([customizing])[fx47plus="true"] #titlebar,
	#main-window[tabsintitlebar]:not([sizemode="normal"]):not([tabsontop="false"]):not([customizing])[fx47plus="true"] #titlebar {
	  margin-bottom: -28px !important;
	}
}