This only works in popup windows. According to the guy who made this website [1] this is to stop cross-origin communication, which is quite interesting. But it also has the effect that if you force popup windows to appear in tabs rather than windows then you do indeed burn the feature with fire. And IMO it's worth doing anyway, because no one has the right to open a browser window on my computer except me. It's possible in FireFox by changing browser.link.open_newwindow.restriction to 0 in about:config [2].