Rated 4 out of 5 stars

First off, I really don't see the developer's grounds for omitting development of black- or white-lists (frankly, I can't imagine myself needing a blacklist, only white), other than that initial development led to two distinct projects - I'd still like to see a consolidated addon. Regardless, I'd like to say that both this and RefControl are excellent, light-wight and unobtrusive addons! In fact, (unless a long time ago) this is my first review I could be bothered to write.. because, in summary, this is a great little addon, reeks of back-to-basics quality and goes a long way for users wanting to add another straw to their bundle when attempting to maintain online privacy and the likes. :)

This review is for a previous version of the add-on (0.43.1-signed). 

RefControl is the work of a third party, hence the two distinct addons.