Yes, essentially. But that's still Firefox, and it makes sense to refer to it as such when talking about global things like Manifest V2 support, adblocking, and other basic functional blocks from eagle view.
And then we can go into details and talk about differences between Firefox forks, Librewolf being just one of the most popular. This is important to talk about, just not in this particular context.
It's like uniting and arguing in favor of Linux regardless of the distros - distro wars are still valid, but not something we should immediately load onto a Windows user. Heck, even if person goes for a goddamn Ubuntu, it will be an improvement. Same logic.