@-moz-document url-prefix(view-source) {
  #viewsource
  {
    visibility: collapse !important;
    -moz-user-focus: ignore !important;
  }
}@-moz-document url-prefix(about:home) {
  #launcher,
  #launcher * {
    visibility: collapse !important;
    -moz-user-focus: ignore !important;
  }
}