For Google™ Authenticator. Click edit button and add button, then drag mouse to select QR code area to add new account.
This extension is also a QR code reader. Your data will be auto sync with Google Account if you have logged in.
Stricter CSP(Content Secure Policy) that make sure this extension can not send data to anyone, including its author. Please contact with author via firstname.lastname@example.org if you have any question.