The gnome window title bars are obnoxiously thick and useless by default tho. I've found that Unity or even just Windows like styling in Gnome is a lot more respectful to your screen real estate.
I wish it was simply configurable from the settings dialogs.
I've recently installed kde on one of my laptops (I usually use i3) and firefox is pretty wonky there. For example, with the OOB configuration, if I double click the top border of a window, it will maximize vertically. Firefox seems to ignore that. It does fully maximize if I double click the title bar, though.
The sad bit is where you realize that GNOME is typically only found on the other 5%.