Examine source code of us cars

{
  "theme": {
    "images": {
      "theme_frame": "american_cars_persona.jpg"
    },
    "colors": {
      "frame": "#0eeb33",
      "tab_background_text": "#f2e9e9"
    }
  },
  "version": "2.0",
  "name": "us cars",
  "manifest_version": 2,
  "description": "us cars"
}