Comment by yoklov

Yes, sort of (more about the process: https://github.com/mozilla/fxa-auth-server/wiki/onepw-protoc...). Key difference: you don't need to sync all the data up again, since there's a separate key for that, which doesn't change.

That said, if you forget your password you do lose remote synced data. The hope is that you have at least one device connected that still has the data, which will upload it in that case. This doesn't work in all cases (there's a pretty common and unfortunate pattern where someone reinstalls their OS, doesn't remember their password, and loses data as a result)

You can also generate and store a separate recovery key to help avoid data loss, https://support.mozilla.org/en-US/kb/reset-your-firefox-acco....