Prevent iframed links from navigating out of edit page
sometimes linked pages redirects away from the edit page... would be nice to prevent that behavior
AdminIlmari Heikkinen (Developer, FHTR) commented
I made the embedded iframes default to having sandbox="allow-scripts allow-forms", so that they can't navigate the top-level page. If you want to open a link in a new tab, you need to right-click and open in new tab. You can turn off the iframe sandbox by adding unsafe after the URL (http://foo.com/page.html unsafe).
Also, added <base target=_blank> to the presentation pages.