Rated 5 out of 5 stars

Very helpful tool! The possibility of setting a time limit for blocks is very useful. You don't end up disabling the tool out of frustration when you just want a quick look at a website, but ensures that you don't linger too long.

After spending 15 minutes configuring it to block (and whitelist) sites, it spears me
a lot of wasted time. Thanks, James!

This review is for a previous version of the add-on (