Examine source code of Bart_simpson

{
  "theme": {
    "images": {
      "theme_frame": "Bart.jpg"
    },
    "colors": {
      "frame": "#b8a7a7",
      "tab_background_text": "#e6d8d8"
    }
  },
  "version": "2.0",
  "name": "Bart_simpson",
  "manifest_version": 2,
  "description": "los simpson"
}