Examine source code of Cute Little Cookie

{
  "theme": {
    "images": {
      "theme_frame": "COOKEH.JPG"
    },
    "colors": {
      "frame": "#ba1cbd",
      "tab_background_text": "#ea4ced"
    }
  },
  "version": "2.0",
  "name": "Cute Little Cookie",
  "manifest_version": 2,
  "description": "It's a cookie!"
}