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

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

	#main-window:not([customizing]) #status-bar{
	  -moz-appearance: none !important;
	  background: none !important;
	  border: none !important;
	  border-right: none !important;
	}
	
	#ctraddon_addon-bar:not([customizing]) #status-bar{
	  margin-top: -1px !important;
	  margin-bottom: -1px !important;
	  padding-top: 0px;
	  padding-bottom: 0px;
	}

	#main-window[customizing] #status-bar{
	  -moz-appearance: none !important;
	  background: none !important;
	  border: none !important;
	  border-right: none !important;
	  min-width: 50px !important;
	  opacity: .5 !important;
	  background-image: repeating-linear-gradient(135deg,
						rgba(255,255,255,.3), rgba(255,255,255,.3) 5px,
						rgba(0,0,0,.3) 5px, rgba(0,0,0,.3) 10px) !important;
	}
	
	#main-window[customizing] #ctraddon_addon-bar #status-bar{
	  margin-top:-1px !important;
	}
	
	#status-bar statusbarpanel {
	  -moz-appearance:none !important;
	  border:none !important;
	}

	#ctraddon_statusbar[cui-areatype="menu-panel"] #status-bar,
	toolbarpaletteitem[place="palette"] > #ctraddon_statusbar #status-bar,
	#ctraddon_statusbar[cui-areatype="menu-panel"],
	toolbarpaletteitem[place="palette"] > #ctraddon_statusbar {
	  width: 100px !important;
	}
	toolbarpaletteitem[place="toolbar"] #ctraddon_statusbar {
	  min-width: 50px !important;
	}
	
	/* temp. workaround for 'Request Policy' add-on until dev adds a fix for Fx 29+ */
	#requestpolicyStatusbar {
	  display: inline !important;
	}

}