Examine source code of Robert Johnson

{
  "theme": {
    "images": {
      "theme_frame": "RobertJohnson_.jpg"
    },
    "colors": {
      "frame": "#7c7d79",
      "tab_background_text": "#fffefc"
    }
  },
  "version": "2.0",
  "name": "Robert Johnson",
  "manifest_version": 2,
  "description": "Robert Johnson, el rey del delta blues."
}