The proposed solution using AdBlockPlus is valid too but this is not one I would personally support because this makes the sites you visit lose revenue which in turns slowly kills the 'free internet' and I would not like to see the ads disappear and users pay each site their consult (in an ideal world, we would have the option to choose between seeing ads and paying an ad-free access to websites) Hope I could help Phil. You will need to visit this site again to opt-out again. An other option you might consider is to use the NAI website which will allow you to opt-out from all companies that advertise like Criteo: They also all use cookies so your choice will be lost if you delete cookies. But let's say you do Phil, I don't know your habits in terms of deleting cookies, Criteo or any other companies for that matter should not show you banners again unless you visit a retail or travel site that works with them again. The average person doesn't clear cookies that often. I think you are generalizing your own specific cases as web gurus.