message: Improve settings in dark mode in Firefox
diff: @@ -152,6 +152,12 @@ h2 ~ h2 {
  }
  @-moz-document url-prefix('') {
  + @media (prefers-color-scheme: dark) {
  + :root {
  + --background-color: #201f24;
  + }
  + }
  +
  body > :not(hr) {
  margin-left: 6px;
  margin-right: 6px;
  