Examine source code of Good Tool

{
  "manifest_version": 3,
  "name": "Good Tool",
  "description": "Free mortgage & rental calculators for smarter housing decisions. Compare payments, analyze refinancing, and more.",
  "version": "1.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "good-tool@goodtool.org",
      "strict_min_version": "109.0"
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Good Tool Extension"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [],
  "host_permissions": [],
  "author": "goodtool.org",
  "homepage_url": "https://goodtool.org",
  "minimum_chrome_version": "88"
}