Examine source code of Best DNS Lookup

{
  "manifest_version": 3,
  "name": "DNS Lookup",
  "version": "1.0.1",
  "description": "Perform DNS lookups for any domain directly from your Firefox toolbar.",
  "homepage_url": "https://github.com/example/dns-lookup-extension",
  "author": "DNS Lookup Team",
  "browser_specific_settings": {
    "gecko": {
      "id": "dns-lookup@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "clipboardWrite",
    "downloads",
    "activeTab"
  ],
  "host_permissions": [
    "https://dns.google/*",
    "https://cloudflare-dns.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "96": "icons/icon96.png",
      "128": "icons/icon128.png"
    },
    "default_title": "DNS Lookup"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  }
}