Examine source code of BetterChat for Meet

{
  "manifest_version": 2,
  "name": "Better Chat for Meet",
  "version": "2.6.0",
  "description": "Control multimedia para windows a traves del chat de Google Meet",
  "icons": {
    "48": "icons/logo-48.png",
    "96": "icons/logo-96.png"
  },
  "permissions": [
    "storage",
    "notifications",
    "nativeMessaging"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://meet.google.com/*"
      ],
      "exclude_matches": [
        "https://meet.google.com/"
      ],
      "js": [
        "popup.js",
        "chat_client.js"
      ],
      "css": [
        "popup/popup.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background/lang/langs.js",
      "background/background.js",
      "background/onInstallUninstall.js"
    ]
  },
  "options_ui": {
    "browser_style": true,
    "page": "options/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "chatbot@addon.net"
    }
  }
}