Timer tab lets you limit your online hours

Are you looking for an easy way of cutting short your online hours ?
Timer tab let's you do exactly that.
It has three easily configurable features : stopwatch,timer and alarm.It even lets you keep a track of hours that you've spend online.
Just open http://www.timer-tab.com/ in a new tab of your favorite browser, configure the timer options to a specified time when you would like to stop browsing the web.