/* This is just an example. You shouldn't do this. */ #rallyposter-hello { color: red ! important; } #rallyposter-toolbar-button { list-style-image: url("chrome://rallyposter/skin/toolbar-button.png"); -moz-image-region: rect(0px 24px 24px 0px); } #rallyposter-toolbar-button:hover { -moz-image-region: rect(24px 24px 48px 0px); } [iconsize="small"] #rallyposter-toolbar-button { -moz-image-region: rect( 0px 40px 16px 24px); } [iconsize="small"] #rallyposter-toolbar-button:hover { -moz-image-region: rect(24px 40px 40px 24px); }