Many websites prevent embedding in other pages using a technique called “x-frame-options”. Websites can prevent browsers from loading them, if they are embedded using an iframe (the most common way to do this.)
This plugin is able to bypass this by using a proxy, which removes this protection from those pages.
For security reasons, all cookies are removed from pages, which are embedded using this workaround. This means, all websites, which require a login won't work.
To enable this workaround, simply click the “x-frame-options” checkbox in the configuration dialog of the tile macro:
This workaround uses modern web technologies, which are not supported by Microsoft Internet Explorer and Edge yet.