Improves my productivity at work.

can block keyword... this is a 100% useful feature

Really really good for productivity. It makes it so easy to stop habitually checking a website.

Does what it says. Solid.

Does what it says it does on the box. I really like the customizeability, and the delay pages are great for giving me those two minutes to think about if I really want to go somewhere.

It does what it's supposed to do and it does it good!

Great addon for saving time.
One small bug: the settings screen doesn't display properly on Firefox for Android in portrait mode. The left hand side of the page is cut off (though works fine in landscape mode)

Useful little plugin that helps keep you on task. It has the awesome feature of being able to set different amounts of time for different groups.

I'm from China and I am always tortured by the " virus catcher" such as 金山毒霸 which colonizes my start page when I turn on my Chrome and Google. I even entered the regedit and tried to fix those browsers, but it never wored. Every time I start a browser the "duba.com" would appear instead of a neat start page with my bookmarks and often-used sites. Then I found this, which could block literally everything like a Mr.Muscle cleans a jammed toilet. It feels UNSTOPPABLE, UNBLIEVEABLE and most of all, like you are having your time of your life. THE best blocker in the world, definitely! If I figure out how to donate this in China I would certainly give hundres ( could you guys open Ali pay or We Chat pay? Or even Google Pay? which I could use to help you guys create another masterpiece like this?)
Anyway, a great add-on