Examine source code of Amazing Grace

{
  "theme": {
    "images": {
      "theme_frame": "AmazingGrace_1.jpg"
    },
    "colors": {
      "frame": "#666699",
      "tab_background_text": "#ccccff"
    }
  },
  "version": "2.0",
  "name": "Amazing Grace",
  "manifest_version": 2,
  "description": "Amazing Grace, how sweet the sound,\nThat saved a wretch like me.\nI once was lost but now am found,\nWas blind, but now I see."
}