Examine source code of Snoopy Easter Egg

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#0bb52d",
      "tab_background_text": "#030303"
    }
  },
  "version": "2.0",
  "name": "Snoopy Easter Egg",
  "manifest_version": 2,
  "description": "Snoopy laying on a colorful Easter egg, with scattered flowers on a blue background."
}