Examine source code of WA+

{
  "manifest_version": 2,
  "name": "WA+",
  "description": "A professional tool to extract group participants and metadata seamlessly from WhatsApp Web.",
  "version": "1.1.5",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "wa-plus@fard.pt",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "downloads"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'; img-src 'self' data: https://*.whatsapp.net https://*.fbcdn.net;",
  "browser_action": {
    "default_title": "Default Popup Title",
    "default_popup": "popup.html"
  }
}