Saved passwords disappeared after update, but 392 login records remain in logins.db

After a recent Firefox update, all of my saved passwords disappeared. I checked my Firefox profiles and found that the current `logins.json` and `logins-backup.json` files were newly created on August 30, 2026 and contain no passwords. However, in the older profile data I still have: * `logins.db` — approximately 480 KB, modified August 19, 2026 * `key4.db` — approximately 288 KB, modified August 18, 2026 * `signedInUser.json` * `storage-sync-v2.sqlite` I opened a COPY of `logins.db` using DB Browser for SQLite. It contains: * 392 records in `loginsM` * 5 records in `loginsL` The records clearly contain my saved websites in the `origin` field. The table columns are: `_rowid_` `id` `origin` `httpRealm` `formActionOrigin` `usernameField` `passwordField` `timesUsed` `timeCreated` `timeLastUsed` `timePasswordChanged` `secFields` `guid` The `secFields` values begin with: `eyJhbGciOiJkaXIiLCJlbmMiOiJBMjU2R0NNIn0` Unfortunately, after discovering that my passwords were missing, I also reset my Mozilla account password. I understand that this may have affected the server-side Sync data. My main question is: Since the 392 encrypted login records are still physically present in the local `logins.db`, is there a supported or technically safe way to recover/decrypt those records and restore them to Firefox? I still have the older `key4.db` and have preserved copies of all of these files without modifying the originals. I am currently also attempting Windows File Recovery to look for an older deleted `logins.json`, but I would especially appreciate guidance on whether the surviving `logins.db` can be used for recovery. Bill