Examine source code of Smiling cat

{
  "theme": {
    "images": {
      "theme_frame": "Smilingcat1.jpg"
    },
    "colors": {
      "frame": "#fcfcfc",
      "tab_background_text": "#fcceb0"
    }
  },
  "version": "2.0",
  "name": "Smiling cat",
  "manifest_version": 2,
  "description": "Cats and dogs are beautiful. Animals are a wonderful gift from nature to humans, we must love them and protect them."
}