If you are interested in privacy or even in IT security or developing, this is a great tool. I personally find this extremely useful, both to better educate myself on the inner workings of the internet (uMatrix helped a lot with that, too!), plus if you are a data nerd, you will get a lot from this Add-on. I use it along with uBO and I hope Raymond reads this: you helped me understand privacy a lot better with these practical tools, and I am certain I am far from the only one. Thanks, and cheers.