Examine source code of Meet Message Notification

{
  "manifest_version": 2,
  "name": "Meet Message Notification",
  "version": "1.1",
  "description": "Help teachers to see participant Message When Browse Tab is Hide during presentation",
  "icons": {
    "48": "icons/meet.png"
  },
  "permissions": [
    "notifications",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://meet.google.com/*-*"
      ],
      "js": [
        "mynew.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "mynew.js",
    "icons/offline.png",
    "icons/online.png"
  ]
}