Examine source code of purple moon

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "purple moon",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(45, 0, 100)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(16, 0, 34)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(13, 0, 28)",
      "toolbar_field_text": "rgba(200, 153, 255, 0.76)",
      "tab_line": "rgb(199, 152, 255)",
      "popup": "rgb(16, 0, 34)",
      "popup_text": "rgba(200, 153, 255, 0.76)",
      "tab_loading": "rgb(199, 152, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e7e8474d-fe55-46b1-a9bf-956c40098643}"
    }
  }
}