This reminds me of “frame buster” JavaScript. It was a piece of JS that goes in the site to combat above mentioned behavior and “freed” your webpages from someone else’s content frame.
Is this the same as now right clicking on an iframe and selecting "Show This Frame Only"?
No -- the point of a frame-buster script is that it's a script included on a page to force that page out of a frame, it's not something the user runs deliberately.