Examine source code of PunyCodeChecker

{
  "name": "PunyCodeChecker",
  "version": "2.0",
  "manifest_version": 2,
  "icons": {
    "128": "icon.png"
  },
  "author": "NCIIPC India",
  "browser_action": {
    "default_title": "Punycode Checker",
    "default_popup": "ClearListofExemptedURLs.html"
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "PunyCodeChecker.js"
    ]
  },
  "web_accessible_resources": [
    "PunyCodeCheckerSiteBlocked.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "58.0"
    }
  }
}