I do. It helps me stop getting sidetracked online. When I see how many minutes or hours have slipped away, it refocuses me. This tool is invaluable to me now. Since I discovered E.gg Timer I haven't stopped using it. I can't recommend this highly enough. It's saved me from burnt dinners too! All you do is input a time, says 20 minutes, and the countdown begins. You do need to keep a tab or window with it open while it's running but you can minimize that. I just use the Faviconize Tab add-on for FF so it doesn't take up much room. When the time has expired, it will beep and display a full screen sized "time expired" message that jumps right to the front of your screen. It's easier to just test it than me explain it, so give it a whirl.