Browser auto fill

I have a very nasty issue with chrome (and maybe other browsers) automatically filling ‘random’ fields in bubble forms. For example I have a field for ‘firstname’ and it automatically fills my email address (from the browsers auto fill cache). How Do I prevent fields from being auto-filled?

Thanks!

For some reason it tried to fill the email address of saved autologon accounts. Deleting these from google’s cache solved the issue.