Bug causing the browser to shutdown

I just discovered this bug.

When you're on a page/website that you can go back to (the back button is not greyed out), if you hold the back button and drag it to the left (or any position), the browser will entirely close itself.

This behaviour occurs every time I do that. From the second time, it even fails to recover my closed pages, so I have search through my history and reopen them manually.

Edit: You don't even have to drag your mouse, just click and hold the back button.