Examine source code of Musical Tree

{
  "theme": {
    "images": {
      "theme_frame": "header350.jpg"
    },
    "colors": {
      "frame": "#f2eded",
      "tab_background_text": "#9dfd99"
    }
  },
  "version": "2.0",
  "name": "Musical Tree",
  "manifest_version": 2,
  "description": "Music tree and music notes."
}