Examine source code of Autodarts Bell

{
  "manifest_version": 3,
  "version": "1.3",
  "name": "Autodarts Bell",
  "description": "Plays a bell sound when its your turn.",
  "developer": {
    "name": "withcream"
  },
  "host_permissions": [
    "https://play.autodarts.io/*",
    "wss://play.ws.autodarts.io/*"
  ],
  "icons": {
    "16": "images/logo16.png",
    "32": "images/logo32.png",
    "64": "images/logo64.png",
    "128": "images/logo128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://play.autodarts.io/*"
      ],
      "js": [
        "scripts/content.js"
      ]
    }
  ],
  "page_action": {
    "show_matches": [
      "https://play.autodarts.io/*"
    ],
    "default_icon": {
      "16": "images/bell16.png",
      "32": "images/bell32.png",
      "64": "images/bell64.png"
    },
    "default_title": "Autodarts Bell"
  },
  "web_accessible_resources": [
    {
      "matches": [
        "https://play.autodarts.io/*"
      ],
      "resources": [
        "audio/bell.mp3"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@autodartsbell",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "id": "@autodartsbell",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}