This add-on was working fine right up until Firefox 57. Mozilla gave plenty of time for add-on developers to get their ducks in a row before Firefox 57 dropped. And yet LastPass still does not have this add-on working, -weeks- after Mozilla released 57. Even this most recent release that dropped yesterday is still not working. I cannot authenticate with Google Authenticator, therefore I cannot log into the add-on. And what's really frustrating is that they've doubled their price for the software!