Does a browser allots an account with a unique username and password?

When you set up a new account, you probably spend some time coming up with a strong password for it (or use a password generator to do the work for you). But how much time do you dedicate to your username? Chances are, you’ve been using the same one for years. Whether it’s a high school nickname or a combination of your name and surname, reusing it everywhere could have some serious consequences.