less-shit-windows.js

function confirm() {
  CustomEvent.observe(LiveEvents.LIVE_BEFORE_WINDOW_LOAD, function(win) {
    if (win.toString() !== "LiveWindowChatFloating") return;
    
    win.box.setToolbarCloseOnClick(function() {
      var confirm = window.confirm("Are you sure?");
      if (confirm !== false) {
        CustomEvent.fire(LiveEvents.LIVE_EVENT, LiveEvents.LIVE_LEAVE_CHANNEL, this);
        this.fire(LiveEvents.WINDOW_CLOSE);
      }
    }.bind(win));
  });
}

var script = document.createElement("script");
script.textContent = "(" + confirm.toString() + ")();";
document.body.appendChild(script);