Yes and No.
Yes as there is FF 12, of course.
No, as there is no newer FF ESR as 10.0.4
Everybody who has FF 10.0.4 has FF ESR and is using FF ESR for the reason.
He is not interested in stable FF 12.x of FF 13, but in FF ESR 10.0.5.
But I agree it is minor issue as most people use FF auto updates/notifications.
Edit: FF ESR also uses it own update channel, so it is never auto updated to normal FF