This is saving my writing career. Easy to set to block the sites I know I want to visit, while leaving the sites (like Google Books) that I need for research. Easy to disable (sometimes) if I want to spend my precious life energy on wasteful activities. But when it works, and I try to visit my verboten site, it shows the blocked access screen and I breath easy and refocus on work. Highly recommended.

Massively improves productivity

Honestly, I created an account just to review this add-on. I know LeechBlock is very simple, yet it has greatly improved my work. I'm doing a PhD and should manage my time by my-self. Thus, I am free to procrastinate, which lead to very bad habits. I was introduced to LeechBlock by my girlfriend and it is doing an amazing job for me! I stopped thinking about procrastinating, am a more effective person in general and my work is beginning to lift off. Thanks!

I put this on for Reddit, Twitter and Youtube with 5 minute allowances every 4 hours. Works like a charm and has helped me really cut down on time spent

Perfect,

close enough.

[EDIT]
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Thanks for your VERY reactive answer <3
Meanwhile, I found a trick that is even better in my case ; I set it up on 2 minutes every 15 minutes, and does not turn off the page (so if I stay with my work group and do not change conversation, I can still work.
Omg, I REALLY DO love your add-on !! Wish I could give more stars !!
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Does the job but a bit too perfectly as I set it up. I needed to stop Facebook. Well, it's done, and I'm glad with that.
But I need facebook/messages (Messenger) to keep working with some student groups ; is there a way to add some exceptions?
Thanks!
(I'd contribute if my bank account would allow me to.)

Much needed! Should be an inbuilt feature in the browsers :D. I love the "Block Set" feature, thereby I can categorize my distraction websites and set different block times for each set.

Very useful. Has all the features you would want from such an extension. Really improves productivity!
Developer is also very helpful and quick to respond to questions!

This thing is great if you have attention issues like me and love to switch to time wasting pages. Does what its supposed to do. Now if only I could make myself do that also.

This is a fantastic blocker, where I can specify precisely what I want! The only thing that I'd wish for is more than 6 block-sets, so that I can be even more specific about what I want to do with each site.

A functional and helpful addon to design time saving restrictions on the web and to eradicate bad online habits

Simple, feature-rich, and very transparent - great add-on!