Una possibile modifica per Firefox Quantum che va a integrare uno sfondo personalizzato per la nuova scheda (about:newtab) e la home page (about:home), basato sul thread nella community di Reddit. Maggiori informazioni disponibili sul blog: https://wp.me/pdQ5q-8Rw

userContent.css

@-moz-document url(about:newtab) {
    .activity-stream {
        background-image: url(coffee.jpg) !important;
        background-size:cover !important;
        background-attachment: fixed !important;
    }
    @media (min-width: 1280px) {
      .activity-stream main {
        margin-left: 625px !important;
      }
    }
    @media (min-width: 1920px) {
      .activity-stream main {
          width: 736px !important;
        margin-left: 870px !important;
      }
    }
}

@-moz-document url(about:home) {
    .activity-stream {
        background-image: url(macbook.jpg) !important;
        background-size:cover !important;
        background-attachment: fixed !important;
    }
    @media (min-width: 1280px) {
      .activity-stream main {
        margin-left: 625px !important;
      }
    }
    @media (min-width: 1920px) {
      .activity-stream main {
          width: 736px !important;
        margin-left: 870px !important;
      }
    }
}