Examine source code of DavidBowie Labyrinth 2

{
  "theme": {
    "images": {
      "theme_frame": "DavidBowie4.jpg"
    },
    "colors": {
      "frame": "#70676b",
      "tab_background_text": "#70676b"
    }
  },
  "version": "2.0",
  "name": "DavidBowie Labyrinth 2",
  "manifest_version": 2,
  "description": "Labyrinth 2"
}