I followed the very clear instructions to make sure I wasn't missing anything, and I had set up the add on correctly. Still, it straight up blocked a site, although I had set it up to block me after 30 minutes. It's a very easy to use system, and I am 100% certain that I didn't tell the add on to block me- I set it up to block me after 30 min in a day. I hadn't used the website at all yet today. The grayscale filter also produced an intolerable level of lag that resolved when I removed the add-on. I installed a similar add on that was able to allow me limited access to the target website.

Instead of limiting the time I could spend on the target website, it entirely blocked it and redirected to the alternate website I had selected. I hadn't used the target website at all today, and it wouldn't allow me to use it for the 30 minutes I had set it up for. If you want to just block a website, this is effective for that, but if you're looking to limit the time you spend on a website, you'll have to find something else.

Perfect. Special thanks for nifty options like requiring a random 128 char token displayed as an image to access the add-on settings. Combine it with Firefox Policies and you can't even uninstall or disable the add-on. Lovely.

My favourite web blocker. Highly customizable. You can even set time-limit resetting every two hours or every week.

absloutly recommend it to anyone thats looking for a little control over their browsing habits :)

It reminds me how much time I have used for certain kinds of time wasters and eventually blocks the sites. I have been looking for an option less intrusive than blocking sites in the router, and this fits perfectly. I think funktionality like this, healty surfing, should be a built-in in the browser. As it stands I can see that Leechblock have some issues accurately calculate the number of minutes on a certain site. A built-in could help that.

A marvelous app!

I've got a bad habit of opening some websites when I'm distracted. Now I get to see the blocked page which asks me to write a review. So I'm doing that instead of being productive.