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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).