Examine source code of WPP Transcritor

{
  "manifest_version": 2,
  "name": "WPP Transcriber",
  "version": "2.0.0",
  "description": "Transcreve áudios do WhatsApp Web com IA",
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "*://web.whatsapp.com/*",
    "*://wpp-transcriber-backend.vercel.app/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://web.whatsapp.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "injected.js"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon48.png",
      "96": "icons/icon96.png"
    }
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "wpp-transcriber@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "personalCommunications"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}