Examine source code of WapiPro — Export WhatsApp Contacts to Excel

{
  "manifest_version": 2,
  "name": "WapiPro — Export WhatsApp Contacts to Excel",
  "version": "2.0.3",
  "description": "Export contacts from WhatsApp Web chats, groups and labels to Excel, CSV or vCard. Free plan included.",
  "permissions": [
    "https://web.whatsapp.com/*",
    "https://wapipro.com/*",
    "http://localhost:8000/*",
    "https://www.googleapis.com/*",
    "https://oauth2.googleapis.com/*",
    "activeTab",
    "tabs",
    "downloads",
    "storage",
    "identity"
  ],
  "background": {
    "scripts": [
      "service_worker.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://web.whatsapp.com/*"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "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"
  },
  "web_accessible_resources": [
    "injected_main.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@wapipro.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}