Ghost: Open links in new tab

ghost-link

//By default, Ghost opens links in the existing tab. Insert this in your Ghost JS file to get all your links to open in a new tab instead!
    $('a').each(function() {
   var a = new RegExp('/' + window.location.host + '/');
   if(!a.test(this.href)) {
       $(this).click(function(event) {
           event.preventDefault();
           event.stopPropagation();
           window.open(this.href, '_blank');
       });
   }
});

You could also check this.href.indexOf(window.location.host) == -1 if it is in internal or external link.

See this blog article for more information and a detailed instruction how to use the code in Ghost and another HTML workaround for every post or page.