I've been using leechblock for years. Great functionality, really improved my productivity. I recommend it to all my students.

Oh, performance... After deleting this add-on a CPU usage becomes 0-3% again (but it was 30%!)

Reliable and doesn't slow down my browser experience/performance in any way. I've used LeechBlock for years and it has kept me from succumbing to meaningless web browsing. Thank for for being free and doing a great job.

I really like the extension. It has all of the features that I require. My only issue is that twice now it deleted all of the blocks, settings, that I wrote for it, so I had to start with it from the beginning. Both times happened after I did some update..

Update: It seems this has been fixed. 5 stars for an awesome extension which helps keep me productive

[Edited] Nice plugin which works as expected AND has good support. Note: For the override feature to work, be sure to enable "[X] Allow temporary overrides" in options. This has stumped me, but the dev looked into it and figured out my problem, which means extra points for support. :-)

Great addon, but not recommended for laptop users, as it seems to eat CPU. Loading up the about:performance tab shows LeechBlock consistently consuming huge amounts of CPU whilst doing nothing. Had to reluctantly uninstall it.

Excellent !!!!

Great - very useful to keep addictive websites at bay

Easy to set up and use. Life-saving aid to break addiction to social media websites.

it has everything i need. Block page and let me study. very good work

Best app

The best add-on if you want to stop getting distracted when you need to get work done. Very simple interface and super easy to use, have had no problems so far!

No doubt one of the most useful and important extensions. 10/10