Best

This makes it easy to block sites I find distracting, which helps me focus.

Просто работает.

100% working ... Easy to use ... But ...!!
1- This Add-on dosn't show on Tool bar
2- In order to be active and 100% efficient ... you have to type the desired website to be blocked twice
>> www.xnxx.com
>> xnxx.com
3- Your children/teens can delete blocked website (porn, action with killing , etc...)
4- You can't put password to unlock blocked websites

It is very useful as it can block even https sites.
Design is simple and easy to understand.

Genial/usefully

Me gusta.Hace su trabajo perfectamente. Me ha bloqueado las paginas que no deseo. Muy bien.

One of the better Add-ons I like. My only displeasure is a some has said it doesnt block pop ups even if it blocks the site. I would also like import, exports, and sync of lists along with more options but besides its good and its the best option out there. I love it and recommend it! Great Add-On.

You save my time I use it always with Social media sites .
Suggest to add short cut in right click to delete site i added quickly.

Nice and simple. Just works. The list of sites to block, reached by editing the add-on's preferences, is crowded like the 1990s Yahoo.com homepage and makes my eyes want to skip over it, so i have to sort of force myself to recall that the place to add new sites to block is just above that, but other than that cosmetic quibble this extension simply does exactly as it says — blocks sites — without the temptation of setting times that sites are available which leads to wasting time tweaking settings.

Blocks the sites you want to block and requires fewer permissions than the other site blocking extensions; simple to use.

SafeMode showed FF getting hit by first hijacker in many years.
The sleazy "myfirsttab.com" search settings redirect con
Immediately added it to your Block Sites along with its very long link to the adware/crapware sites:
us.search.yahoo.com/* -and- www.reimageplus.com/*
Bang, dead. At least Bing Searches are no longer sent to those intrusive Yahoo SOBs!
Now I have to waste an hour or more on a stinking Firefox refresh to hopefully purge the hijacker.
Thanks for giving us the ability to create a blacklist WITH re-redirects!
Very handy little add-on.

Very good add-on, better than the more famous one

works in normal window, new window, privacy window. nice addon

Good. Does what it is supossed to do. Easy to use.

add-ons that must be owned in Firefox

This is the best addon to block url. Awesome and works as expected. I can add redirect pages too and it works well. :) Cheers to the developers !

works perfectly and is easy to use.

I just want to blocks sites that I regularly visit. I want to learn not waste my time!

I was using this to block wiki hits on my searches and it was working great, but now it seems to have turned itself off. Or more likely I did something to turn it off. (idiots use wiki)

Excelente. Para o que se propõe é altamente funcional. Obrigado.

Complimenti,
semplice ed efficace.