Alerts user with an icon if an iframe is detected on the page.
Alerts users if an iframe is present on a web page with a page content icon that appears on the right side of the url. Purpose is to provide additional security to protect against sites compromised by iframes with malicious script.
How can an iframe affect my security?
Pages often utilize iframes legitimately, but proceed with caution if these are used on sites with sensitive information (banking, username/password).