Examine source code of Crystal skull

{
  "theme": {
    "images": {
      "theme_frame": "Crystalskull1.JPG"
    },
    "colors": {
      "frame": "#9ef7cc",
      "tab_background_text": "#a6d8f7"
    }
  },
  "version": "2.0",
  "name": "Crystal skull",
  "manifest_version": 2,
  "description": "from the British museum"
}