Examine source code of Prime UnixDate

{
  "manifest_version": 2,
  "name": "Prime UnixDate",
  "version": "5.7.10",
  "description": "Convertir des timestamps Unix. Gratuit et sans publicite.",
  "permissions": [
    "storage",
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9eca828d-8a1b-413d-a060-cce7974cf003}",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "author": "H. Lee",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png"
    }
  }
}