Very, VERY aggressive. I mean, it does a good job alright, but be warned, this thing blocks pretty much EVERYTHING! Even when you turn it off, it still blocks EVERYTHING! You have to disable the extension to stop it from blocking everything. For example, my CamelCamelCamel price tracker extension won't work then this is enabled. Any sort or icon or link for a social media site will disappear. I would only recommend it for advanced users because having this installed will cause a lot of confusion for average users.

I mean, if you want something that REALLY goes for it in privacy, then this is, but be prepared to disable this if you get strange behaviour with other add-on extensions or websites.