Some websites such as Facebook, Instagram, Pinterest, YouTube, and more do not allow their content to be loaded inside an IFRAME, which is what is used inside Redframe’s modal window.

Redframe maintains a list of websites that are known to be incompatible with IFRAMEs and will automatically detect if an external page is going to one of these sites. If an incompatible link is detected, the page will load in a new tab rather than inside the modal window.

For more information about external pages, read Create an External Page.