@-moz-document url(chrome://browser/content/browser.xul) 
{
  #urlbar .autocomplete-textbox.textbox-input  { 
    font-family: "Liberation Mono", "Tahoma" !important;
    color: black !important;
    font-size: 9pt !important; 
    }

   label.statusbarpanel-text { 
    font-family: "Tahoma" !important;
    color: black !important;
    font-size: 8pt !important; 
    }

   tab {
     font-family: Trebuchet MS;
     font-size: 12px;
     }

}