title: How to prevent same website open multiple tab pages?
body: <p>I have a scenario that prevents the same website in multiple opened tab pages of browser. My idea is when user open a website at first time from browser, it's fine, when user produces the new tab page or external link to open the same website again, we should redirect it to already opened one.
  I have no idea how to implement. Can I have some clues? Thanks.</p>