This meta-bug tracks the work needed to store the personal information used by the requestAutocomplete and Form Autofill features, and synchronize it between different Firefox profiles.

I think we should consider storing ISO 3166-2 codes (hopefully that's what libaddress input also uses) for the address-level1 field over the free-form text in the backend as once we have free-form text, it will be hard to migrate back the ISO 3166-2 and it would be nice to support <input autocomplete="address-level1" maxlength=N> for N=1…3 when the full name of the region is longer than 3 characters. In the case of minlength > 3, we would lookup the name in a database such as libaddressinput to provide the full name. In other words, we would prefer to fill and store the ISO 3166-2 code whenever possible.