- Edited
In Orion, holding ⌘ command when clicking on a link opens it in a new tab. Naturally, holding ⇧ shift should open the link in a new window. This is the convention for most browsers except Safari. In Safari, it is used for adding the link to reading list.
Currently, this feature only works with the links in Bookmarks Bar but it should apply to all links and the back/forward entries too: