I have been searching absolutely ages for a keyword blocker that actually worked on Android (my phone cannot download blocksite) this app is so simple yet does everything you would need it to do. How so many other blockers don't include a keyword blocking function is beyond me. Thank you for making this Firefox add on!

Great tool

The NG stands for Never Gonna procrastinate again

Best productivity tool I have experienced

OMG Wow.

I have wanted this feature in Firefox Android for so long, it is brilliant and life (time saving). The implementation such as the options access random password is brilliant. I had been using Kaspersky safe kids to achieve the same goal (although it doesn't work in Firefox) but Leechblock does it so much better.

Welcome productivity.

As an aside would be great if could donate in another way than PayPal.

Is there an altenative that does not crash the browser periodically?

Love this extension. Simple and elegant, allows you to block multiple websites with different settings, all free. I've tried others and this one has the most features. Nothing unnecessary - just super useful. Use it to curb procrastination during the work day and to resist online shopping, etc. - the different settings and block times for different categories makes this possible and stops you from constantly changing the settings to get around it! Thanks!

Update: still using it over a year later, still works great!