#navigator-throbber
  {
    -moz-binding          : url("chrome://global/content/bindings/button.xml#button");
    border                : none;
    list-style-image      : url("chrome://global/skin/animthrob_single.gif");
    margin                : 2px 2px 2px 1px;
    min-width             : 0px;
    padding               : 1px;
    cursor                : pointer;
    -moz-user-focus       : ignore;
  }  
  
#navigator-throbber > .button-box
  {
/*
    border                : 1px solid transparent;
*/
    padding               : 0px;
  }
  
#navigator-throbber > .button-box > .button-text
  {
    display               : none;
  }  

/*
#navigator-throbber:hover > .button-box
  {
    border                : 1px outset #CCD0DD;
    padding               : 1px !important;
  }  

#navigator-throbber:hover:active > .button-box
  {
    border                : 1px inset #CCD0DD !important;
    padding               : 2px 0px 0px 2px !important;
  }  
*/
  
#navigator-throbber[busy="true"]
  {
    list-style-image      : url("chrome://global/skin/animthrob.gif");
  }