[Solved] Window decoration / theme on Linux

I am using Nightly on Linux (XFCE).
Suddenly, the window decoration changed and is not the same as the one I set up for the environment.
What setting do I change in order to make it use the environment window decoration?

Found: I have to enable window title display

Any chance somebody knows how to make the title bar (or the close-minimize-maximize) buttons compatible with the Unite GNOME extension?

Right now I’m getting two sets of buttons for Firefox, and only for Firefox.

Never mind, just needed to restart Firefox with titlebar enabled: https://github.com/hardpixel/unite-shell/issues/201