Examine source code of Cooookie

{
  "theme": {
    "images": {
      "theme_frame": "cookie_header.png"
    },
    "colors": {
      "frame": "#d60fd9",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Cooookie",
  "manifest_version": 2,
  "description": "The drawing is not mine. I found it in an avatar somewhere I can't remember. So kudos to whoever did it! \nI just love it :)"
}