Furthermore, add-ons are often unavailable on the default browsers of smartphones and tablets, making it difficult for even the highly skilled to protect their privacy. A final reason that browser add-ons provide insufficient remedy is the fact that advertisers devote significant resources to overcoming such barriers and will always find creative ways to bypass user intent. Thus, on one hand we have users who are poorly equipped to defend themselves with available technical measures, and on the other, highly motivated and well-funded corporations with cutting-edge technologies.