It is not security hardened from what I can tell. Most of Librewolf’s patches could be applied to build Zen with security hardening. Alternatively, patch Zen browser with Arkenfox user.js (upstream project to Librewolf’s security hardened default profile)
The split view seems really useful. I was actually just fiddling with that on my laptop with two browser windows.
How does this compare to LibreWolf or other Firefox derived projects?
It is not security hardened from what I can tell. Most of Librewolf’s patches could be applied to build Zen with security hardening. Alternatively, patch Zen browser with Arkenfox user.js (upstream project to Librewolf’s security hardened default profile)