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

При аварийном выключении Firefox высвечивается пустая страница дополнения, на которой ничего нет. У других дополнений такой проблемы нет.
С недавних пор вообще перестал работать - белая страница, переустановки не помогают.

Great and simple add-on , however If I allowed a blocked site for a certain time , it doesn't auto block it after the countdown is finished , the page has to be refreshed to allow the addin to block it , would be really appreciate to fix this minor bug and thanks for the addin :)

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.