You could argue that the security patches Mozilla applies takes time to be applied to Librewolf, and also that all you need to do in Firefox is change a couple of options in the settings. People debate over which one matters more, having better privacy defaults or being extremely quick to patch exploits.
Isn’t Librewolf fork of Firefox with hardened features pre-enabled?
It is.
You could argue that the security patches Mozilla applies takes time to be applied to Librewolf, and also that all you need to do in Firefox is change a couple of options in the settings. People debate over which one matters more, having better privacy defaults or being extremely quick to patch exploits.
In the real world I imagine it hardly matters.