Although I'm not a Techie (Yet), I do have my opinion on this, I use Firefox and the only real add-on I use actively that is similar to that is Ad-Block Plus just to stop those annoying pop-ups, apart from my Anti-Virus, Firewall and Anti-Spyware I don't have anything else for my computer protection and I've never been infected by a Virus or got Scammed by anything.It's really up to the User if they want to use it or not, but I think it depends on how the user thinks or there actual experience on a Computer, in my case I notice most Good and Bad things on a webpage and just don't click on the bad things e.g. Links and Ad's. If a user (i.e. A Novice User) doesn't feel they can identify Good or Bad things on a webpage they will feel safer with that running, I think it can get in the way when I'm browsing so don't use them.A lot of the time Common Sense can be used when clicking on links, If you have any doubt about the authenticity of the link then don't click it, just as simple as that. I heard a story in the News a few weeks ago where around 50 People were conned into thinking they had won a Holiday to somewhere through a email they received, they were asked to send there Passport and Birth Certificate to confirm there Identity, Now just state the bloomin obvious wouldn't you think that sounds fishy, Well they didn't and sent there Passports and Birth Certificate out (they would obviously never get them back). So my advice over anything is don't rely on Software to do the Job for you all the time, Use your own noggin that's what it is there for :).