This extension is based on a script by David J. Bradshaw: https://github.com/davidjbradshaw/iframe-resizer
iFrame Resizer automatically resizes the height and width of iFrames to fit their contained content.
This solution consists of 2 extensions:
• iFrame Resizer, This extension must be placed on the page with the inline frame, also known as the ‘Parent’.
• iFrame Resizer – Content. This extension must be placed on the content page. The page that is displayed inside the inline frame. Also known as the ‘Child’.
You can download the new extension through the Extension Manager (Menu->Tools->Extension Manager->Online Gallery).
or here
http://extensions.quickandeasywebbuilder.com/
PDF documentation is included in the download.