> > Great discussion. The worry I have with any stored key file is that I > suspect many of the users resetting their passwords no longer have the old > hardware. Their old one died. They bougt a new one. Signed in to their > cloud accounts, and treated Firefox like any other cloud-based account. >
Old hardware isn't so much of an issue, IMO; after all, we'd be storing the key. The big trick would be shaping the password reset flow during sign-in to make this non-routine behavior feel smooth — you'd need to carefully get the user to recover their key in a Firefox client, perhaps with server-side help, during or immediately after the reset flow. Maybe another question is: Of the user who are resetting their passwords, > how many have zero devices currently connected to Sync? Phrased differently: how many users are about to lose server-side data by resetting their password? (Not all users will care about the data in the account, and some will have all of their data locally already.) I think we mostly know this number on the server side already. Certainly we can see when a device last synced to that account, and we can see if there are any (desktop) device registrations with that FxA…
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