Fantastic! Does exactly what it says and there's lots more under the hood. A pity it's not compatible with Firefox Mobile.

Excellent. Fantastic options. Just what I was looking for (for my autistic son).

This extension is a no-frills, functional block site extension. I personally like using their timed close feature, which closes websites that you blocked automatically so there aren't any distractions. Highly recommend.

very nice add-ones. I blocked the bilibili, youtube. saved my time.