Examine source code of Cat in Black

{
  "theme": {
    "images": {
      "theme_frame": "cat.jpg"
    },
    "colors": {
      "frame": "#030303",
      "tab_background_text": "#91846f"
    }
  },
  "version": "2.0",
  "name": "Cat in Black",
  "manifest_version": 2,
  "description": "cat cats pet pets black animal animals"
}