Username checker for Instagram

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Username checker for Instagram",
  "version": "1.2",
  "description": "Free service to check if a Instagram username is available. It fast and correct checks to let you know if a nickname is available.",
  "icons": {
    "128": "iname_icon.png"
  },
  "host_permissions": [
    "https://instausername.com/"
  ],
  "manifest_version": 3,
  "action": {
    "default_title": "Check availability Instagram name",
    "default_icon": "iname_action.png",
    "default_popup": "checker.html"
  }
}