If you use Firefox for any productivity, such as paying bills, you should NOT install this. It CONSTANTLY breaks third-party payment processor functionality with no warning and no clues only frustration making your safety worse than without it. While this is might be great for granular control, it is the OPPOSITE of its "with no loss of functionality" mission. This is the #1 go-to source of browser errors that I am constantly troubleshooting and it takes HOURS of time sifting unfamiliar site names to figure out what to tweak because it provides no help when it breaks something (like a search box)--you just have to go on a lengthy trial and error quest one by one to figure out which of 30 sites to trust to get a search bar working and by that time I don't remember what I was going to search for. So you end up just globally trusting everything and that defeats the whole purpose.