Specify host permissions

{
  "name": "My",
  "manifest_version": 3,
  // ...
  "host_permissions": [
    "*://*/"
  ],
  // ...
}

"host_permissions" - list hosts (domains) that extension will have access to
\*://\*/ - our extensions will be allowed to access all websites

link_youtube: https://youtu.be/xNkNjQQiUFs