Good idea but it keeps deleting my blocking options/sets. Might have to do with Firefox Sync.

My recommendation to users is to keep a copy of the URLs you want to block etc in a text file so you don't have to come up with them again! Also, always check "Immediately block pages on these sites once blocking conditions are met", otherwise this add-on is useless.

Works really well, stays out of my way but allows for reasonable access to sites when necessary.

So far it does what it is supposed to do and keeps me focused on work

Oh, man, I remember when I had this add-on. It was almost life-saving. (If I were a more dramatic person, I would've said it was DEFINITELY life-saving.) I think I stopped having it after numerous Firefox update that made the version I used incompatible. I haven't felt the need to block certain sites again, thanks to the disciplined habit this add-on helped me build. But now, I'm slipping on the procrastination track, and no better time than to re-install this add-on.

The add-on is highly versatile and doesn't dictate you on how and when to use it. Multiple options make it highly customisable to your own needs, including multiple options of site-blocking groups (i.e., you don't have to worry about needing to access one site while it's being blocked together with another site -- put them in different group, activate them separately, and you're good), scheduled blocking time, ability to start blocking at any time you want, and the option to override the block if you desperately need to (personally not recommended to use unless it's a life or death situation).

If you're looking for a site blocker that's easly altered to your needs as well as easy to use, this is the one for you.

Excellent extension! I removed a star because of a bug I just found: it seems that if you use "blank page" instead of "default page" in the "how to block" section, the site is not actually blocked. Happy to give the star back when this is corrected.

Edit: I was not able to reproduce the bug, so I'm giving back the fifth star. :-)

Awesome... I run a small business and this app is very much wonderful to keep my workers focus. I wish to be able to redirect blocked sites to keep them focused on work related sites

unexpectedly high customization and functionality, very clean, +1

Awsome.

Now I can limit how much I'm on certain time-consuming websites! Once it's set up, you'll be saving time handily. I personally go with 15 minutes of breaks (on Facebook, Wikipedia, and any other addresses I've added to the list) for every two hours.

Absolutely brilliant, does everything you'd want it to do and then some (e.g. a 60 seconds delay really works wonders for me), really well thought out add-on, big thanks to the developer!!

Its Save my time as well

Works well. I recommend partnering with someone to have the access password.

It's extremely useful, works similar to mobile phone app blockers (: