Since footnotes can contain links to section on the same page or even other footnotes the question is, what should happen when a user clicks such a link.
At the moment, all links the user clicks inside of a reference popup will open in a new window/tab. - For links to the same page this might not make sense.
The question came up while discussing T215195
Note: Page-Previews do not share that issue because they do not show links in the preview text.