{ pkgs, ... }@all: with all; lib.mkIf (hyper.isPersonal) {
  programs.thunderbird = let
    inherit (lib.generators) toJSON;
    extensions = toJSON {} {
      "addon@darkreader.org" = "71d6c69d-55f9-4c56-888c-abdcf6efd73d";
    };
  in {
    enable = true;
    profiles = {
      "${hyper.user}" = {
        isDefault = true;
        settings = with rice.color; {
          "calendar.alarms.showmissed" = false;
          "calendar.alarms.playsound" = false;
          "calendar.alarms.show" = false;
          "extensions.webextensions.uuids" = extensions;
          "mail.startup.enabledMailCheckOnce" = true;
          "mailnews.mark_message_read.delay" = true;
          "mailnews.mark_message_read.delay.interval" = 3;
          "mailnews.tags.$label1.color" = red.base;
          "mailnews.tags.$label1.tag" = "Important";
          "mailnews.tags.$label2.color" = yellow.base;
          "mailnews.tags.$label2.tag" = "Work";
          "mailnews.tags.$label3.color" = green.base;
          "mailnews.tags.$label3.tag" = "Personal";
          "mailnews.tags.$label4.color" = cyan.base;
          "mailnews.tags.$label4.tag" = "To Do";
          "mailnews.tags.$label5.color" = blue.base;
          "mailnews.tags.$label5.tag" = "Later";
          "mailnews.headers.showMessageId" = true;
          "mailnews.headers.showOrganization" = true;
          "mailnews.headers.showReferences" = true;
          "mailnews.headers.showSender" = true;
          "mailnews.headers.showUserAgent" = true;
          "toolkit.legacyUserProfileCustomizations.stylesheets" = true;         
        };
        userChrome = with rice.color; /* css */ ''
          body,
          #navigation-toolbox,
          #calendarContent,
          #calSidebar,
          #tabpanelcontainer,
          #spacesToolbar,
          #tabs-toolbar,
          #calMinimonth,
          #primaryButtonSidePanel *,
          .minimonth-week,
          .multiday-header-corner, .day-column-heading, calendar-header-container, calendar-event-column, .multiday-hour-box,
          #view-box,
          #tabs-toolbar,
          #status-bar,
          .calview-toggle,
          #calview-toggle-item,
          #folderPaneHeaderBar,
          #folderPane,
          #threadPaneHeaderBar,
          #threadTree,
          #tabs-toolbar {
            color: ${foreground} !important;
            font-family: ${rice.font.base.name} !important;
            background-color: transparent !important;
            background-image: none !important;
            border: none !important;
            -moz-appearance: none !important;
          }
          .minimonth-nav-section {
            background-color: rgba(${rice.lib.hex-to-rgb-comma-string background},${builtins.toString rice.transparency}) !important;
            border: ${builtins.toString rice.border-width}px solid ${border};
          }
          .button,
          .button-primary,
          .tab-content[selected] {
            background-color: ${accent.base}; 
            color: ${background};
            background-image: none; 
          }
          html {
            background-color: rgba(${rice.lib.hex-to-rgb-comma-string background},${builtins.toString rice.transparency}) !important;
          }
        '';
      }; 
    }; 
  };
}