Examine source code of Swett Cats

{
  "theme": {
    "images": {
      "theme_frame": "Jodinundkado.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ff0000"
    }
  },
  "version": "2.0",
  "name": "Swett Cats",
  "manifest_version": 2,
  "description": "mein kater und seine mutter\n\nMy Cat and he´s mom"
}