AS far as Mozzila is saving auto-fill data (address, phone numbers, etc...) there should be easier way to edit them than searching profile for formhistory.sqlite and edit the values in DB Browser for SQLite...
AS far as I looked (and google) there is no user-friendly way to do that in browser settings
in recent version.
(And yes, being unable to conveniently check and change the data cost me money recently thanks to bad auto-fill, so that finally moved me to submit this).