Run Tampermonkey script on domain but not on iframes [duplicate]

Question

This question already has answers here:

How to exclude iframe in Greasemonkey or Tampermonkey? (2 answers)

Closed 3 years ago.

How can I prevent Tampermonkey from running on iframes?

E.g. I write a script for

// @include       http://*.youtube.com/*
// @include       https://*.youtube.com/*

The script will also run on external websites with embedded YouTube players. That's unneeded and even expensive when Tampermonkey fires 20 times on a page with 20 YT players.

How can I set the script to only fire when the surfed website is youtube.com?

Answer 1

If your script really only runs at Tampermonkey (and/or Greasemonkey and/or Scriptish) you also can use the @noframes directive.