Examine source code of Eat the cake

{
  "theme": {
    "images": {
      "theme_frame": "eatthecake.jpg"
    },
    "colors": {
      "frame": "#00a840",
      "tab_background_text": "#00ff88"
    }
  },
  "version": "2.0",
  "name": "Eat the cake",
  "manifest_version": 2,
  "description": "Just for fun :3 it was randomly made XD"
}