Rated 5 out of 5 stars

this is a great app, extremely easy to use and has meant i can block pages and revise for my exams without being tempted by facebook, twitter, youtube or tumblr between 6.30 & 9pm every day (the time when i revise) 5*'s.

This review is for a previous version of the add-on (0.6.3.1-signed).