Here is a Python library implementing all of the OATH OTP-linked standards (HOTP, TOTP and the more obscure OCRA):
If works as google-authenticator but in the browser. You can put the bookmarklet near the QRCode as simple <a/> link, and people can bookmark it. Just click on the bookmark and a message box open with your password. I think it only works with decent browsers (chrome&mozilla).
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