To use these add-ons, you'll need to download Firefox
Override the user-agent string presented to Google Search pages to receive the search experience shown to Chrome.
LeechBlock NG is a simple productivity tool designed to block those time-wasting sites that can suck the life out of your working day. All you need to do is specify which sites to block and when to block them.
Tomato Clock is a simple browser extension that helps with online time management.