There is no need to hope! Luckily all firefox based browsers can be hardened, Librewolf is just hardened by default. I recommend using Arkenfox. It can be applied to your default profile or an additional profile.
I would say Zen by default is a bit more private than default Firefox but not by a lot.
As someone who has had to.cut out a lot of shitty people recently… Fuck do I miss this feeling.