Examine source code of URL Checker

{
  "manifest_version": 3,
  "name": "URL Checker",
  "description": "This addon allows users to check URLs / sites using VirusTotal. This ranges from being able to right-click on a link or page and checking for VT results to storing links within a folder, so that you can easily re-scan common links as often as you need and with ease of location and automation. A VirusTotal API key is not needed, but can be used.",
  "version": "1.0.0",
  "author": "FambinoBambino",
  "icons": {
    "16": "icons/extension-icon/tabler--virus-search-16-green.png",
    "32": "icons/extension-icon/tabler--virus-search-32-green.png",
    "48": "icons/extension-icon/tabler--virus-search-48-green.png",
    "128": "icons/extension-icon/tabler--virus-search-128-green.png"
  },
  "permissions": [
    "storage",
    "menus",
    "notifications"
  ],
  "host_permissions": [
    "https://www.virustotal.com/*"
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "URL Checker"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@URL-Checker",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}