What a scare! From the title I thought it was a proposal for firefox, I imagined how half of the buttons would disappear and the other half would be repositioned in fat panels with cute curves.
This is so clean! I know of fork of Firefox called floorp that has a gnome theme built in which works very well. Still I don't think it was as good as this one.
I think KDE looks nice but what you said makes it seem like it's questionable to make a gnome theme over a KDE one? I get that you don't like it but the person who made this probably uses gnome like you and wants consistency, or just likes the gnome design. So if that's the case why would they make a KDE theme?
That is stupid me, I thought it is something like a request. Even now I looked closely I think I tried some other theme and I will test this one too, maybe it is better, than that I tried before.