Examine source code of Solo Sound

{
  "manifest_version": 2,
  "name": "Solo Sound",
  "version": "1.2",
  "description": "Only one tab plays sound at a time. When a tab starts playing audio or gets unmuted, all other audible tabs are automatically muted. Short sounds and notification tabs (Gmail, Slack, etc.) are ignored. Both the threshold and the ignored titles are configurable.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a61c32d6-fecc-4aad-a680-4beb7da0913d}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "icon.svg",
    "128": "icon.svg"
  },
  "background": {
    "scripts": [
      "defaults.js",
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  }
}