It doesn't reduce the number of tabs I have open - in fact, it probably increases it by removing th technical barrier. Everyone once in a while I go though my open tabs and either read them, bookmark them, or close them. I believe there's an extension that will actually automatically close your oldest tab when you open a new one if you have more than n tabs open, but I don't much see the point of it - if I need a fresh, uncluttered tab bar for some project I use tab groups. Comittment devices are cool and all, but sometimes the technical issue is the real issue, not tht psychological one.