configs/arch-config/.mozilla/firefox/igdh4jud.default-release/chrome/userContent.css

@media (-moz-proton) {
  @-moz-document url("about:home"), url("about:newtab") {
    /** Activity Stream - Search Focus Border: like URL ***********************/
    /* At DarkMode, Color */
    body[style*="--newtab-background-color:rgba(28, 27, 34, 1);"],
    body[style*="--newtab-background-color:rgba(42, 42, 46, 1);"],
    body[style*="--newtab-background-color: rgba(42, 42, 46, 1);"] {
      /* inner */
      --newtab-focus-border: rgba(0, 221, 255, 0.5) !important; /* Original: #B5D3FF, Better color-mix(in srgb, #B5D3FF 70%, transparent) */
      --newtab-focus-border-selected: rgba(0, 221, 255, 0.5) !important; /* Original: #B5D3FF */
    }

    /** Activity Stream - Web Site Icon: full size ****************************/
    .top-site-outer .tile .icon-wrapper {
      width:  100% !important; /* Original: 48px */
      height: 100% !important; /* Original: 48px */
    }
  }

  /** Error Page - Restore illustrations **************************************/
  @-moz-document url-prefix("about:neterror"),
  url("about:restartrequired"), url("chrome://browser/content/aboutRestartRequired.xhtml"),
  url("about:sessionrestore"),  url(chrome://browser/content/aboutSessionRestore.xhtml) {
    /* Illustrations Position */
    #errorPageContainer, .description-wrapper {
      min-height: 300px;
      background-position: left center;
      background-repeat: no-repeat;
      background-size: 38%;
    }

    #errorPageContainer {
      display: flex;
      flex-direction: column;
    }
    .description-wrapper {
      padding-inline-start: 38%;
    }

    /* Container */
    .container {
      min-width: var(--in-content-container-min-width); /* 13em */
      max-width: var(--in-content-container-max-width); /* 52em */
    }

    /* Text Position */
    #text-container {
      margin: auto;
      padding-inline-start: 38%;
    }
  }

  @-moz-document url-prefix("about:neterror?e=connectionFailure"),
  url-prefix("about:neterror?e=netInterrupt"),
  url-prefix("about:neterror?e=netTimeout"),
  url-prefix("about:neterror?e=netReset"),
  url-prefix("about:neterror?e=netOffline"),
  url("about:restartrequired"), url("chrome://browser/content/aboutRestartRequired.xhtml") {
    #errorPageContainer {
      background-image: url("./icons/error-connection-failure.svg");
    }
  }
  @-moz-document url-prefix("about:neterror?e=dnsNotFound") {
    #errorPageContainer {
      background-image: url("./icons/error-server-not-found.svg");
    }
  }
  @-moz-document url-prefix("about:neterror?e=malformedURI") {
    #errorPageContainer {
      background-image: url("chrome://browser/skin/illustrations/error-malformed-url.svg");
    }
  }
  @-moz-document url-prefix("about:neterror?e=clockSkewError"),
  url-prefix("about:neterror?e=nssFailure") {
    #errorPageContainer {
      background-image: url("./icons/blue-berror.svg");
      background-size: 18.5em;
    }
  }

  @-moz-document url("about:sessionrestore"), url(chrome://browser/content/aboutSessionRestore.xhtml) {
    .description-wrapper {
      background-image: url("./icons/error-session-restore.svg");
    }
  }

  @-moz-document url-prefix("about:neterror?e=fileNotFound") {
    @media (min-width: 970px) {
      .title {
        background-image:
          url("chrome://global/skin/icons/info.svg") !important;
      }
    }

    #text-container {
      padding-inline-start: 0;
    }
  }
  @-moz-document url-prefix("about:tabcrashed") {
    @media (min-width: 970px) {
      .title {
        background-image: url("chrome://browser/skin/tab-crashed.svg") !important;
      }
    }
  }
  @-moz-document url("about:robots"), url("chrome://browser/content/aboutRobots.xhtml") {
    @media (min-width: 970px) {
      .title {
        background-image: url("chrome://browser/content/aboutRobots-icon.png") !important;
      }
    }
  }
  @-moz-document url("about:welcomeBack"), url("chrome://browser/content/aboutWelcomeBack.xhtml") {
    @media (min-width: 970px) {
      .title {
        background-image: url("./icons/welcome-back.svg") !important;
      }
    }
  }
}