override chrome://firebug/skin/debugger.css chrome://firebug/skin/mac/debugger.css
override chrome://firebug-os/skin/firebug.css chrome://firebug/skin/mac/firebug.css
override chrome://firebug-os/skin/panel.css chrome://firebug/skin/mac/panel.css
override chrome://firebug-os/skin/window.css chrome://firebug/skin/mac/window.css