2! Authenticator

On a webpage that displays a QR code for a two-factor code to be consumed by an app such as Google Authenticator ©, open the extension and select the overflow menu, and click Scan.  If successful, you will be prompted to add the two-factor code to your list of rolling codes, edit entries if necessary and click the add button. 

Limitations
Many websites limit the ability to scan QR codes, functionality is limited.