It's in unstable. However gnome 43.1 is not. I don't think you should skrive for latest firefox for security reasons. ESR is perfectly fine for all I know. But for performance and new 🔔 and whistles that's another story.
I'm on arch at but I tend to miss solus. Arch is just very easy with zram and aur. I have Solus as my main page though. Looking forward to new current-kernel and possibly new isos given time.
