Examine source code of Sitemap XML Validator

{
  "manifest_version": 3,
  "name": "Sitemap XML Validator",
  "version": "2.0.0",
  "description": "Auto-detects sitemap XML on current tab OR paste any sitemap URL to validate all <loc> entries",
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "rajivkhanduja786@gmail.com",
      "data_collection_permissions": {
        "is_data_collection": false,
        "uses_data_collection": false,
        "data_disclosed": false,
        "data_disclosure_justification": "",
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Sitemap XML Validator",
    "default_icon": {
      "64": "icon.png"
    }
  },
  "icons": {
    "64": "icon.png"
  }
}