very good Rated 4 out of 5 stars

What can I say.. it works!

But... doesn't seem to match long addresses, an issue for some sites.

This review is for a previous version of the add-on (0.6.6.1-signed). 

Great! Rated 5 out of 5 stars

Would be even better if there's a 'time currency' feature where visiting a certain productive site would add extra time to the time limit for accessing distracting websites.

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