As soon as I install/enable this extension, Firefox slows down exponentially. If I let it run for more than a minute or two I end up locked out of my desktop environment and I'm forced to hard restart my machine.

Tested on Firefox 73.0.1, Kubuntu 18.04, KDE/Plasma 5.12.9

It's great. I could never give this extension up forever.

If you're anything like me this extension will make you really aware of just how addicted to social media you are. Highly recommended productivity extension!

After I switched from Chrome to Firefox, the first thing I was looking for was an alternative to StayFocused add-on, and a little Googling led me to this incredibly useful add-on for Firefox. What follows is my first impression, not a fuller review:

1. It is relatively easy to access the settings here. It should not be because when I am addicted to a site, I would just simply change the setting after my allocated time expires. Thus, the very purpose of using the add-on becomes pointless. It should be much more challenging to change the settings so that we are "forced" to maintain a strict schedule. I would request the developer to put this on their priority list.

Good stuff with a lot of settings but I'd like some features like a timer on the blocked pages for the blocking period, and the ability to view current blocks on the tray icon

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.