Examine source code of Autumnal Sunset

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Autumnal Sunset",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(82, 0, 5, 0.87)",
      "toolbar_text": "rgb(255, 126, 0)",
      "frame": "rgb(82, 0, 5)",
      "tab_background_text": "rgb(51, 243, 255)",
      "toolbar_field": "rgba(255, 0, 14, 0.16)",
      "toolbar_field_text": "rgb(239, 255, 0)",
      "tab_line": "rgb(255, 126, 0)",
      "popup": "rgb(207, 164, 0)",
      "popup_text": "rgb(130, 0, 2)",
      "tab_loading": "rgb(255, 126, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3443bb09-9855-4eaa-b50b-87e2b809e665}"
    }
  }
}