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

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

	.tab-throbber[progress] {
	  list-style-image: url("chrome://classic_theme_restorer/content/images/throbber-loading-fx39.png") !important;
	}

}