Examine source code of Default compact dark theme

{
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "default-compact-dark-theme@glitchii.github.io"
    }
  },
  "name": "Default compact dark theme",
  "description": "A theme with a dark color scheme.",
  "author": "Mozilla",
  "version": "1.2",
  "theme": {
    "colors": {
      "tab_background_text": "#fbfbfe",
      "tab_selected": "rgb(66,65,77)",
      "tab_text": "rgb(251,251,254)",
      "icons": "rgb(251,251,254)",
      "frame": "#1c1b22",
      "popup": "rgb(66,65,77)",
      "popup_text": "rgb(251,251,254)",
      "popup_border": "rgb(82,82,94)",
      "popup_highlight": "rgb(43,42,51)",
      "tab_line": "transparent",
      "toolbar": "rgb(43,42,51)",
      "toolbar_top_separator": "transparent",
      "toolbar_bottom_separator": "hsl(240, 5%, 5%)",
      "toolbar_field": "rgb(28,27,34)",
      "toolbar_field_border": "transparent",
      "toolbar_field_text": "rgb(251,251,254)",
      "toolbar_field_focus": "rgb(66,65,77)",
      "toolbar_text": "rgb(251, 251, 254)",
      "ntp_background": "rgb(43, 42, 51)",
      "ntp_card_background": "rgb(66,65,77)",
      "ntp_text": "rgb(251, 251, 254)",
      "sidebar": "#38383D",
      "sidebar_text": "rgb(249, 249, 250)",
      "sidebar_border": "rgba(255, 255, 255, 0.1)",
      "button": "rgb(43,42,51)",
      "button_hover": "rgb(82,82,94)",
      "button_active": "rgb(91,91,102)",
      "button_primary": "rgb(0, 221, 255)",
      "button_primary_hover": "rgb(128, 235, 255)",
      "button_primary_active": "rgb(170, 242, 255)",
      "button_primary_color": "rgb(43, 42, 51)",
      "input_background": "#42414D",
      "input_color": "rgb(251,251,254)",
      "input_border": "#8f8f9d",
      "autocomplete_popup_separator": "rgb(82,82,94)",
      "appmenu_update_icon_color": "#54FFBD",
      "appmenu_info_icon_color": "#80EBFF",
      "tab_icon_overlay_stroke": "rgb(66,65,77)",
      "tab_icon_overlay_fill": "rgb(251,251,254)"
    },
    "properties": {
      "color_scheme": "dark",
      "panel_hover": "color-mix(in srgb, currentColor 9%, transparent)",
      "panel_active": "color-mix(in srgb, currentColor 14%, transparent)",
      "panel_active_darker": "color-mix(in srgb, currentColor 25%, transparent)",
      "toolbar_field_icon_opacity": "1",
      "zap_gradient": "linear-gradient(90deg, #9059FF 0%, #FF4AA2 52.08%, #FFBD4F 100%)"
    }
  }
}