> I understood that Fenix won't support Firefox Sync

Based on my user experience Fenix (Firefox Preview) supports Firefox Sync in terms of bookmarks. I believe history and other data is also synchronized, but I haven't had occasion to test it thoroughly. In my opinion claim that "Fenix won't support Firefox Sync" is a bit too far [0]. I noticed the login/password sync feature has not been implemented yet [1]. I suppose it will might materialize soon, because lack of it could be a huge mistake in terms of usability.

[0]: https://github.com/mozilla-mobile/fenix/issues?q=firefox+syn...

[1]: https://github.com/mozilla-mobile/fenix/issues/5074

Firefox Lockwise is built on Firefox Sync and (IIRC) will eventually become the built-in password manager on Firefox desktop.

It did with Firefox 70, which was released a few days ago.

I don't know the specifics of passwords, but Fenix definitely support sync. Open settings and the first menu item you'll see will be "turn on sync".

(Disclosure: I work at Mozilla but not on Fenix)

I believe they'll add that soon, but they haven't yet because of either:

1) The code base is not production ready yet, and they don't want an issue to come up which leaks users passwords

2) (More likely) They intend to add support for LockBox, their extension that replaces mediocre password support with a full-fledged password manager. And they need the Add-On support before they can include that.

So most probably you'll see this along with add-on support come in the next few months

Answering to my own question, I have looked a bit further into github.

It seems Lockwise can not work on pre Oreo android devices, so in the end, Fenix will get password sync natively as well, and this is a work in progress.