Examine source code of Anti-Use Beep

{
  "manifest_version": 3,
  "name": "Anti-Use Beep",
  "version": "1.0.1",
  "description": "Plays a beeping sound on a webpage, which gets louder as the visit goes on. For when you want to use a webpage less.",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "browser_style": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "anti-use-beep@example.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}