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How to exclude iframe in Greasemonkey or Tampermonkey?

I have created a Greasemonkey script for a website. What the script does is adding a div at the end of the page.

document.body.insertBefore(myDiv, document.body.firstChild);

But now the site adds an iframe for google-ads, as a result my div appears in the iframe too, which is not what I want.

How can I stop the script affecting iframes?

Solution

  • Greasemonkey now supports the @noframes directive (long supported by Tampermonkey and Scriptish).
    Use that for a cleaner way to block operation in iframes.

    Unfortunately, npdoty's answer will now trigger a warning in Firefox's browser console:

    Warning: use of return outside of functions is deprecated and may cause failures in future versions of Greasemonkey.