Examine source code of Brown Horses by Marte

{
  "theme": {
    "images": {
      "theme_frame": "horsesgalop.jpg"
    },
    "colors": {
      "frame": "#bab8b8",
      "tab_background_text": "#400605"
    }
  },
  "version": "2.0",
  "name": "Brown Horses by Marte",
  "manifest_version": 2,
  "description": "brown horses horse gallop animal animals"
}