Preventing pages being open in a new tab/window

Question

I am working on a project that behaves very strange when the user open pages in a new tab or in a new window, causing the app to crash.

I need some javascript that

Answer 1

For me, the other answers are no sensible option, since some hrefs in my document are procedurally changed. This block of code works though:

document.documentElement.addEventListener('click', function (event) {
  if(event.ctrlKey){event.preventDefault()}
});