Examine source code of XML Validator

{
  "manifest_version": 2,
  "name": "XML Validator",
  "version": "1.0",
  "description": "Validate and format XML easily",
  "permissions": [
    "activeTab",
    "clipboardWrite"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{147273bb-8216-4ca4-bcaa-417a9ead82e5}"
    }
  }
}