Examine source code of WA Folders Pro

{
  "manifest_version": 3,
  "name": "WA Folders Pro",
  "version": "1.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "wa-folders-pro@boulify.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "reason": "This extension does not collect any user data."
      }
    }
  },
  "description": "Organize WhatsApp chats with folders, notes, privacy blur & quick replies. Boost your productivity!",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "https://web.whatsapp.com/*",
    "https://api.lemonsqueezy.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://web.whatsapp.com/*"
      ],
      "js": [
        "scripts/content.js"
      ],
      "css": [
        "styles/panel.css"
      ]
    }
  ]
}