Websites expect average people to understand legal agreements that they are signing. They are often far too long for a consumer to read and much too complicated. A browser extension could simplify legal documents and summarize them into points that a normal human can understand.
One of the greatest gifts that you can give is education. Why don't more businesses incentivize employees to learn? They could specifically plan out certain courses that they want employees to take and give bonuses when they do. This would be good for employees and employers.
Smart web browsers enable people to navigate the web faster than traditional browsers. They learn navigation history to give you a personalized experience.