This type of add-on is essential for general surfing of the web... that is it. It get's rid of those annoying, built in pop-ups and features that most sites use these days. The downside is, it can renders some websites completely nonfunctional, even when marked as trusted! I have a feeling it doesn't list everything that is being blocked. I end up disabling it more often than not, having to restart the browser or refresh the page just to log in to my favorite websites. Other than that, it's great for blocking everything, which is it's namesake!