What's the worst thing a Chrome extension could do to you? Well, it could steal your passwords and cookies, or it could continuously close your tabs. Obviously, these are bad and annoying, but there are limitations to the power of extensions. Can they run exe files? Not really. They can download files at any time, but opening those downloads requires a special permission and a user gesture. Can they change your settings? Generally, no. The general design idea for Chrome extensions is that they s...