Examine source code of Online Dance Party

{
  "manifest_version": 3,
  "name": "Online Dance Party",
  "version": "2.4.2",
  "description": "Play Just Dance Now with friends at different locations.",
  "homepage_url": "https://codeberg.org/ODP/extension",
  "icons": {
    "48": "img/icon/icon-48.png",
    "96": "img/icon/icon-96.png",
    "128": "img/icon/icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://*.justdancenow.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://justdancenow.com/",
        "https://www.justdancenow.com/"
      ],
      "js": [
        "js/deps/browser-polyfill.js",
        "js/bundle/inject-redirect.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "js/bundle/redirect.js"
      ],
      "matches": [
        "https://justdancenow.com/*",
        "https://www.justdancenow.com/*"
      ]
    }
  ],
  "page_action": {
    "default_icon": {
      "48": "img/icon/icon-48.png",
      "96": "img/icon/icon-96.png",
      "128": "img/icon/icon-128.png"
    },
    "default_title": "Online Dance Party",
    "default_popup": "popup.html",
    "show_matches": [
      "*://*.justdancenow.com/*"
    ]
  },
  "action": {
    "default_icon": {
      "48": "img/icon/icon-48.png",
      "96": "img/icon/icon-96.png",
      "128": "img/icon/icon-128.png"
    },
    "default_title": "Online Dance Party",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8174d506-9c65-472f-933a-9e9450d30472}"
    }
  }
}