Still the best Rated 5 out of 5 stars

I've tried many site blockers on many browsers, and this one is far and away the best. It's stable and highly configurable. It is the reason I use Firefox as my exclusive browser. Like any blocking system, this add-on is only helpful as a speed-bump, and you have to find the right balance of settings to make you wake up and think about what you're doing without making you so desperate to escape that you bypass it entirely. But with some work, this has become a reliable tool in training myself to stay focused.

Best add-on to help productivity Rated 5 out of 5 stars

Love it. I use this to study and it's awesome. It is the discipline I need when I feel like slacking off when trying to focus either in class or at home. I create the block times to coincide with my lecture times so there is no way I'll waste the entire class on social media or other sites.

Delays and lockdown help me keep focus Rated 5 out of 5 stars

I find LeechBlock very useful. It has helped me break a bad habit of flipping to a news site when I reach a difficult point in my work.

Setting a short delay (20s) for timewasting sites is often enough to make me stop and think before getting sucked in.

Lockdown mode is great for when I know I can't afford to waste time.

Now, back to work!

Helped a lot Rated 5 out of 5 stars

very useful if you spend too much time on to any website..!!

Good idea! Rated 5 out of 5 stars

This is a really good idea. I think this is helpful and more people should know that such an add-on exists. It gives a really good psychological support when fighting procrastination or even addiction.

Love it, but it needs a quick enable function Rated 5 out of 5 stars

It's been helping me alot at stopping procrastination, but there needs to be some way of quickly enabling or disabling certain Block Sets. It would be very useful for studying, for example, as I would be able to use certain Block Sets (like "study" or "concentrate"), with a more agressive setup, and, when finished, just disable it. Thanks !
*EDIT OK, that works! Thanks!!

Did you try the Lockdown feature?

Superb!! Rated 5 out of 5 stars

Really wonderful website blocker with more setting options. Thanks to developer who keeping it freely.

Rated 5 out of 5 stars

good one :-)

God Bless You Rated 5 out of 5 stars

You may have saved my life

This addon improves my GPA by 25% Rated 5 out of 5 stars

It stops me from wasting time by scrolling endless page (Facebook, 9gag, etc). You should try it yourself!

Perfect addon for killing distractions Rated 5 out of 5 stars

I was wasting a lot of time on facebook and youtube. Now thanks to leechBlock I can keep my concentration on what is important

Focus on your study/work and leave those websites for good Rated 4 out of 5 stars

I realized that I was too much distracted by social media websites and "googleing" the next thing to buy. This add on will save you a lot of time

A Great Tool For Focused Studying Rated 5 out of 5 stars

It's way to easy to open my computer with every intention of studying, only to get distracted with social media notifications or websites like Youtube and Tumblr. I'll look up and realize I wasted hours on the internet. With Leechblock, I can set limits for how much time to spend on a website, and block off large portions of study time to only access educational sites.

It's not as well developed as add-ons for some other browsers-- for instance, I don't think you can select different 'block' periods for each website under the same block set. But for what it does, it's really great!

Just what I need. Rated 5 out of 5 stars

I use youtube as my favorite playlist for studying, but there are many others distractions on it. Leech-block blocked youtube while still allowing me to play shared embeded youtube playlist on other social networks like FB.

Contre la procrastination Rated 5 out of 5 stars

parfait pour s'empêcher soi-même de surfer sur des sites idiots qui nous déconcentrent. Au début je doutais du résultat (il faut entrer les sites qu'on repère comme nos pièges à temps) mais en fait c'est très pratique : on peut soit définir des périodes récurrentes de blocage des sites où on se perd, soit décréter une durée de blocage. Et pas trop possible d'y échapper ! Bref je ne pourrais plus m'en passer.

Not well support to the pomodoro. Rated 3 out of 5 stars

I want to use it as pomodoro. but it doesn't work well. We need an option in the menu of leechblock button to quick enable/disable this addon.

useful Rated 4 out of 5 stars

It is by far and large the best productivity tool for firefox. It is about on par with Stayfocusd of Chrome.
But, like any extension, can be made better; the user can see suggestions in

Like this Addon Rated 5 out of 5 stars

I use It for block missclick on link at work vs home. (Some web I don't won't open at work, because of IT observe...)

A cure to evil in the world Rated 5 out of 5 stars

It protects the user's time from some evil social media sites one of which rhymes with 'lacecook'. This addon helps me get rid of this parasitic website.

This review is for a previous version of the add-on (1.0.3). 

Great Rated 5 out of 5 stars

Would love to see sth like this for android app blocking, the "allowed time" option is great... :)

This review is for a previous version of the add-on (1.0.3).