Examine source code of Muted Dawn

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Muted Dawn",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(23, 10, 7, 0.8)",
      "toolbar_text": "rgb(236, 255, 250)",
      "frame": "rgb(60, 48, 41)",
      "tab_background_text": "rgb(233, 201, 184)",
      "toolbar_field": "rgba(0, 0, 0, 0.2)",
      "toolbar_field_text": "rgb(204, 179, 163)",
      "tab_line": "rgb(150, 84, 41)",
      "popup": "rgb(22, 54, 75)",
      "popup_text": "rgb(192, 157, 142)",
      "button_background_hover": "rgb(40, 62, 78)",
      "popup_highlight": "rgb(94, 63, 46)",
      "tab_selected": "rgb(87, 59, 43)",
      "toolbar_bottom_separator": "rgb(87, 59, 43)",
      "toolbar_field_border": "rgb(87, 59, 43)",
      "toolbar_field_focus": "rgb(60, 48, 41)",
      "toolbar_field_highlight": "rgb(150, 84, 41)",
      "tab_loading": "rgb(150, 84, 41)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{737f128f-787c-42b2-8ade-90433a0df4b6}"
    }
  }
}