Lightweight extension , and it works perfectly.

Thanks

Does EXACTLY what it says it does. AMAZING add-on! Thank you!

very good

Very good for......blocking impulses!!! Nice and simple, no annoying messages as with other site blockers, just a clean simple set-up. I likey

Simple, easy to use, easy to understand, very effective, customizable website blocker.

Simple add on; does what it says. I like to have it on my work computer.

So handy. Thanks!

Very good. Does exactly what I needed from addon like this.
Default to blocking time-consuming sites, unlock them for (x) time.