Still seems like there's no first party support for container sync.
A few more settings that don't sync:
- Cookie exceptions
- New tab page config (Top Sites and everything else that you see on that page)
- Certificate exceptions
- Personal certificates
There's an open issue [1], but no resolution yet as it seems.
[1] https://github.com/mozilla/multi-account-containers/issues/3...
I'm confused if this is a feature or an addon, and how testpilot relates