Examine source code of Underwater Effect

{
  "theme": {
    "images": {
      "theme_frame": "top.jpg"
    },
    "colors": {
      "frame": "#44c4e1",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Underwater Effect",
  "manifest_version": 2,
  "description": "The underwater effect makes me feel like going underwater. It inspires me that I can see the surface of the water from below."
}