Examine source code of Twinkle Twinkle

{
  "theme": {
    "images": {
      "theme_frame": "Twinkle_Twinkle_header2.jpg"
    },
    "colors": {
      "frame": "#7ecc08",
      "tab_background_text": "#adb304"
    }
  },
  "version": "2.0",
  "name": "Twinkle Twinkle",
  "manifest_version": 2,
  "description": "stars of several different sizes and shapes."
}