Firefox Monitor: get alerts if your data shows up in a breach

Firefox Monitor is a new service from Mozilla that draws on data from Have I Been Pwned? (previously) to keep you informed when your data is breached and shows up online. The service also includes important advice, including "Treat security questions like extra passwords" by creating "long, random answers." It's good advice: certainly, it's easier to put into practice than convincing your mother to travel back in time and change her "maiden name."