This issue asks for a new action to be added in the page editor and page editor preview, which opens the existing page in a new browser tab or window (depending on the browser's settings). Some use cases ask you to verify or just see page parameters. Sometimes it's desirable to simply see the page _without anything that Magnolia adds to or surrounding it*. This is also useful to see the actual url of the page. This can be useful for testing on a different device.
In the page editor, the action should be added directly after the exising "preview page" action.
In the page bar editor, one button is added on the very end of the right corner, after the language dropdown.
As this must work in Safari, this ticket must be resolved first: DEV-78