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

  #navigator-toolbox {
    -moz-box-orient: horizontal !important;
    overflow-x: scroll !important;
  }

  #navigator-toolbox toolbar, #PersonalToolbar {
    -moz-appearance: menubar !important;
    color: -moz-menubartext;
  }

}