Dual factor options when using the browser extension?

Hi -- first time user of 1stPassword and am very impressed!

Soon after creating my account with 1stPassword, I successfully implemented dual factor authentication with both the Yubikey and Authy. However, it appears that dual factor authentication isn't necessary with the browser extension? (In this case I'm using Firefox on Linux.) Is there a way to give me the option such that dual factor authentication is required when using the extension? I'm a little concerned. Thank you!