Examine source code of Nathalia IA

{
  "manifest_version": 2,
  "name": "Nathalia IA",
  "version": "1.0",
  "description": "Assistente virtual para WhatsApp Web.",
  "permissions": [
    "storage",
    "tabs",
    "https://web.whatsapp.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://web.whatsapp.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cc4b4382-7d22-4e0b-8d45-3b04f64f6da6}"
    }
  }
}