Examine source code of Bach aria

{
  "theme": {
    "images": {
      "theme_frame": "bach_header.jpg"
    },
    "colors": {
      "frame": "#858585",
      "tab_background_text": "#dbdbdb"
    }
  },
  "version": "2.0",
  "name": "Bach aria",
  "manifest_version": 2
}