Examine source code of TD Site Inspector

{
  "manifest_version": 2,
  "name": "TD Site Inspector",
  "version": "2.0.1",
  "description": "Il quadro completo di un sito: stack tecnico (CMS, server, template, plugin, framework, header di sicurezza), audit SEO con punteggio, e strumenti (WHOIS, what-the-font, color picker, evidenzia heading/immagini/link).",
  "browser_specific_settings": {
    "gecko": {
      "id": "site-inspector@tastieredigitali.it",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "webRequest",
    "<all_urls>"
  ],
  "browser_action": {
    "default_title": "TD Site Inspector",
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_security_policy": "script-src 'self'; object-src 'self'"
}