Examine source code of three d pieces

{
  "theme": {
    "images": {
      "theme_frame": "threedpieces.jpg"
    },
    "colors": {
      "frame": "#f7f313",
      "tab_background_text": "#eef76c"
    }
  },
  "version": "2.0",
  "name": "three d pieces",
  "manifest_version": 2,
  "description": "three d puzzle pieces"
}