Webpage/PDF Launching in New Tab Rather than New Window

Hello.  I have a course with a Resources link to a website.  When I click the link, it replaces the course in the tab with the website link and the course disappears from tab view.  My users don't know that it's still live in the toolbar at the bottom of the screen.  Being a global company, it is virtually impossible to communicate this to them.  We must provide a streamlined experience.  Is there a way for the course tab to stay open and the Resources tab open in a new tab?  It appears that way when I view it in Storyline after publishing.  But not once I view it live in my LMS>