Examine source code of Musical Corner

{
  "name": "Musical Corner",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "7.jpg"
    },
    "colors": {
      "frame": "rgba(229, 234, 238, 1)",
      "tab_background_text": "#131314",
      "toolbar": "rgba(228, 217, 237, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(228, 233, 237, 0.07)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9cd361e1-bf5d-4d39-b06f-44cd04e82886}"
    }
  }
}