a small script to get the time needed to close a tab

ClosingTabsTimes.js

// Closing time with mouse, trackpad and keyboard
;(function(){
	var begin = null;
	var mouseMoved = false;

	window.times = {
		mouse: [],
		keyboard: [],
		trackpad: [],
	};

	Object.defineProperty(window.times, 'getAverages', {
		enumerable: false, 
		value: function(){
			console.info('Average for mouse:', times.mouse.reduce((p, c) => p+c) / times.mouse.length);
			console.info('Average for trackpad:', times.trackpad.reduce((p, c) => p+c) / times.trackpad.length);
			console.info('Average for keyboard:', times.keyboard.reduce((p, c) => p+c) / times.keyboard.length);	
		}
	});

	var currentTimes = times.mouse;

	// reset variables
	// and prevent window from closing
	window.onbeforeunload = function(){
		var time = Date.now() - begin;
		currentTimes.push(time);
		console.info('Time', time, 'ms');
		mouseMoved = false;
		return 'plep';
	};

	window.onmousemove = function(){
		if(mouseMoved){
			return;
		}

		begin = Date.now();
		mouseMoved = true;
	};

	window.setClosingMethod = function(method){
		currentTimes = times[method];
	};
})()