demo by kei

/* ==UserStyle==
@name       demo
@version    20240528.02.52
@namespace  ?
==/UserStyle== */

@-moz-document domain("youtube.com") {
/* ==UserStyle==
@name         demo
@namespace    USO Archive
@author       me
@description  demo
@version      20230325.13.46
@license      NONE
@preprocessor uso
==/UserStyle== */
}

@-moz-document url-prefix("youtube.com") {
#logo-icon
  {
    content: url("https://i.gifer.com/28ee.gif") !important;
    width: 80px !important;
    height: 65px;
    object-fit: fit;
  }

  ytd-topbar-logo-renderer
  {
    width: 0%;
  }
}