Examine source code of Otonal

{
  "theme": {
    "images": {
      "theme_frame": "otoo.jpg"
    },
    "colors": {
      "frame": "#f58225",
      "tab_background_text": "#edd32b"
    }
  },
  "version": "2.0",
  "name": "Otonal",
  "manifest_version": 2
}