Examine source code of Remember Summer

{
  "theme": {
    "images": {
      "theme_frame": "footer_pinker.jpg"
    },
    "colors": {
      "frame": "#22d91f",
      "tab_background_text": "#22d91f"
    }
  },
  "version": "2.0",
  "name": "Remember Summer",
  "manifest_version": 2,
  "description": "Remember summer? Pink flower on green, picture taken in Croatia."
}