Maximize and Minimize Buttons Don't Appear In Firefox or Package Updater Gnome 3.16.2

The Maximize and Minimize Buttons Don’t Appear In Firefox or Package Updater. Gnome 3.16.2. I have both of these options selected in gnome-tweak-tool.

Bump please.

I seem to remember something about a Gnome integration extension being available in Firefox; but I haven’t been able to find one that seems correct.