Examine source code of Email Header Analyzer

{
  "manifest_version": 3,
  "name": "Email Header Analyzer",
  "version": "1.0",
  "description": "Paste raw email headers into this sidebar → instantly see IPs, emails, hop chain, SPF/DKIM/DMARC results and one-click abuse lookups. 100% offline & private.",
  "permissions": [
    "storage"
  ],
  "sidebar_action": {
    "default_title": "Email Header Analyzer",
    "default_panel": "sidebar.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "email_header_analyzer@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}