Examine source code of Orange Halloween

{
  "theme": {
    "images": {
      "theme_frame": "halloween_header.jpg"
    },
    "colors": {
      "frame": "#ffc533",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Orange Halloween",
  "manifest_version": 2,
  "description": "Orange Halloween !!!\nA scary Halloween pumpkin on a beautiful orange ground! \nThe writing and the Firefox Buttons are still easily legible!"
}