This extension by James Anderson is truly a blessing. Helps you keep away from distracting web sites during work hours or while studying, it's conditional approach to when to block the sites and then unblock them and then again block them is very helpful!

It works, I just block all websites and use the "+" wildcard to add whitelists to them.
The interface is not that user friendly as compared to Stayfocusd but one visit to the FAQs page and you should be all set.

Vraiment utile et bien conçu. C'est simple, c'est efficace et ça permet de se rendre compte à quel point aller sur les réseaux sociaux est devenu un réflexe et mange un temps fou de nos journées.
De nature anxieuse, j'avais tendance à faire fuir mon esprit à la moindre contrariété en allant sur facebook ou twitter. L'extension installée (et mon smartphone éteint ou laissé chez moi) les effets ont été immédiats, ma productivité a augmenté en flèche et j'ai pu me libérer beaucoup de temps libre ! Je recommande pour tous ceux qui travaillent sur ordinateur.

This is probably the most powerful blocker.

so far, so good - and showing a blank page wakes me up, stops the autopilot FIVE YEARS LATER still excellent. My ADHD means I get stuck on sites, Leechblock gets me out. SEVEN YEARS LATER : Leechblock, i thank u. Without u i'd be stuck on social media for years at a time.

God bless

Best Blocker extension ever. It's Next Generation version is even better, more powerful and gives people more control over internet habits. Couldn't ask for a better blocker anywhere. It also happens to be open source. Thanks to the amazing developers for working on it. <3

Improved productivity drastically

Great help for people like me who is easily excited and can unwillingly spend surfing half an hour instead of a 10 minutes break.
Very configurable and allows different usage patterns.

Great extension! I have rated it low stars before but after used it for few days, I changed my mind. It's truly a time saver, if not life saver.

really good

Great productivity app. The customization is also such a huge plus for me. Great job!

Works like a charm. I really enjoy its versatility, since it allows you to limit the amount of time you can visit a site AND restrict it during certain times of the day (every other site blocker only lets you do one or the other). Best of all, it works in private browsing mode, so you can't cheat without completely overriding it.

The override function does not work.

It always says

"Override unavailable. No override period has been set in the options."

I have both checked and unchecked the "allow temporary override for these sites" options and looked into the Advanced Settings but nowhere is there a place to set that period option.
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RESPONSE TO DEV RESPONSE:

AH! Thank you! I'd suggest explaining that in the error message -- that small copy change would have saved me a LOT of pain.

Es lo mejor que he encontrado para organizar mi vida y mi tiempo. Me permite tomar conciencia de qué es lo que realmente quiero priorizar, y lo puedo hacer según mi forma de trabajar: por días, por horarios, por tiempos, por sitios, e incluso de acuerdo a mi nivel de adicción puedo definir lo drástico del bloqueo. Es una manera de hacerse cargo y responsabilizarse de lo que uno hace con su vida.

Simple, yet so powerful. Liked the layout and UI. Great work, James!! Thank you!