#redirector-button { list-style-image: url("chrome://redirector/content/images/icon_24.png"); } toolbar[iconsize="small"] #redirector-button { list-style-image: url("chrome://redirector/content/images/icon_16.png"); } #redirector-button[disabled="yes"] { opacity: .8; } #redirector-button[disabled="yes"] .toolbarbutton-icon { opacity: .5; }