[javascript] How to close current tab in a browser window?

The following works for me in Chrome 41:

function leave() {
  var myWindow = window.open("", "_self");
  myWindow.document.write("");
  setTimeout (function() {myWindow.close();},1000);
}

I've tried several ideas for FF including opening an actual web-page, but nothing seems to work. As far as I understand, any browser will close a tab or window with xxx.close() if it was really opened by JS, but FF, at least, cannot be duped into closing a tab by opening new content inside that tab.

That makes sense when you think about it - a user may well not want JS closing a tab or window that has useful history.

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