Examine source code of HTTP Headers

{
  "manifest_version": 2,
  "name": "HTTP Headers",
  "version": "1.0",
  "description": "A static reference for HTTP headers with descriptions and security details.",
  "permissions": [],
  "sidebar_action": {
    "default_panel": "sidebar.html",
    "default_title": "HTTP Headers"
  },
  "web_accessible_resources": [
    "headers.json"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2265cc70-0c56-4afc-9262-d5ce93f3c423}"
    }
  }
}