@-moz-document url-prefix("about:") {
  xul|search-textbox:hover {
    border-color: var(--in-content-focus-outline-color) !important;
    transition: border-color 0.5s var(--animation-easing-function);
  }
}
@-moz-document url-prefix("about:config") {
  #about-config-search:hover {
    border-color: var(--in-content-focus-outline-color) !important;
    transition: border-color 0.5s var(--animation-easing-function);
  }
}