This filter did it for me: ||accounts.google.com/gsi/iframe/select$subdocument It blocks just the popups and not the login page itself. But Google may change

This filter did it for me: ||accounts.google.com/gsi/iframe/select$subdocument It blocks just the popups and not the login page itself. But Google may change their methods at any time to circumvent it, so your way is more robust.