free web site blocker

StayFocusd Google Extension

StayFocusd is a Google extension designed to do one thing: prevent you from wasting time when working. Once you install it in Chrome, you won’t have a chance to procrastinate. This extension is great for limiting the time you spend on a website. It can even be used to block the entire Internet. Published by Transfusion Media, the program is very intuitive and can be customized to make Web surfing guidelines to suit your preferences.