Examine source code of Party Halloween

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Party Hellowen",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(15, 15, 15)",
      "toolbar_text": "rgb(193, 193, 193)",
      "frame": "rgb(15, 15, 15)",
      "tab_background_text": "rgb(193, 193, 193)",
      "toolbar_field": "rgb(15, 15, 15)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(156, 126, 19)",
      "popup": "rgb(19, 19, 19)",
      "popup_text": "rgb(140, 140, 140)",
      "icons": "rgb(84, 84, 84)",
      "tab_text": "rgb(255, 178, 51)",
      "tab_loading": "rgb(156, 126, 19)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b001b5e4-ec2b-4b37-9720-07ec5f48060d}"
    }
  }
}