TitlebarTimer.js

javascript: (function () {
	var TIMER_INPUT_DESCRIPTION = 'Enter a timer.\nex)\n  "30"      -> 30sec\n  "01:20" -> 1min20sec\n  "3m"     -> 3min';
	var END_MESSAGE = 'TIMEUP!!';

	var inputSec = function() {
		var input = window.prompt(TIMER_INPUT_DESCRIPTION, '60');
		if(input.indexOf(':') != -1)  {
			var a = input.split(':');
			return parseInt(a[0], 10) * 60 + parseInt(a[1], 10);
		} else if(input.indexOf('m') != -1) {
			return parseInt(input.split('m')[0], 10) * 60;
		} else if (input.indexOf('s') != -1) {
			return parseInt(input.split('s')[0], 10);
		} else {
			return parseInt(input, 10); 
		}
	};
	var defaultTitle = document.title;
    var display = function (time) {
    	if(time <= 0) {
    		document.title = defaultTitle;
    		return;
    	}
    	sec = Math.floor(time / 1000);
    	s = sec % 60;
    	s = s < 10 ? '0' + s : s;
    	m = Math.floor(sec / 60);
        document.title = m + ':' + s;
    };
    var onEnd = function() {alert(END_MESSAGE);};
    var end = inputSec() * 1000 + new Date().getTime();
    console.log("aaa");
    try{if(pomoloop){clearInterval(pomoloop);}}catch(e){}
    pomoloop = setInterval(function () {
        var rest = end - new Date().getTime();
        display(rest);
        if (rest < 0) {
        	clearInterval(pomoloop);
        	onEnd();
        }
    }, 100);
})();

This is a Timer on TitleBar for Bookmarklet.

Run this program on any web site, and enter a timer.
ex)
"30" -> 30sec
"01:20" -> 1min20sec
"3m" -> 3min