Examine source code of Muffin and Cubby

{
  "theme": {
    "images": {
      "theme_frame": "Muffin001.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Muffin and Cubby",
  "manifest_version": 2,
  "description": "Muffin was an abandoned cat.  Nearly frozen, she accepted our hospitality.  Cubby is her big baby boy."
}