The only thing that keeps getting faster is the abandonment of Firefox. It doesn't matter how fast Firefox is, or how private it is, or any of the other garbage the Mozilla foundation has been wasting their time on. If Firefox continues to slip in usage, and eventually into obscurity, it is all for nothing.
A technically superior, or safer, or more private, or whatever the current line of argumentation and marketing is, does not matter. Mozilla VPN does not matter.