Examine source code of little cat

{
  "theme": {
    "images": {
      "theme_frame": "little-cat.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "little cat",
  "manifest_version": 2,
  "description": "simple persona, but i like the footer so much ^^ (press strg+f)"
}