With the tl;dr extension enabled, follow the steps described in the commented source code.

index.html

<h1>tldr leaks memory?</h1>

<!-- Start recording with Chrome Dev Tools using the "Timeline" section. Click 'start' and see the memory usage -->

<!-- pushState() does not work with local files, so you can save this file as 'index.html',
     start a static Python web server with `python -m SimpleHTTPServer` in the same directory and open http://localhost:8000/ -->

<button onclick="start()">Start!</button>

<script>
function start() {
  for (var i=0; i<80; i++) {
		window.history.pushState(null, null, '/'+i)
	}
}
</script>