Examine source code of seaturtle

{
  "theme": {
    "images": {
      "theme_frame": "sea-turtle-2.jpg"
    },
    "colors": {
      "frame": "#226658",
      "tab_background_text": "#f7f4f4"
    }
  },
  "version": "2.0",
  "name": "seaturtle",
  "manifest_version": 2,
  "description": "Save the sea and its creatures"
}