Created attachment 8920769 [details] Captura de pantalla de 2017-10-21 08-45-14.png User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:57.0) Gecko/20100101 Firefox/57.0 Build ID: 20171021000731 Steps to reproduce: I installed FF Dev edition from https://firefox-flatpak.mojefedora.cz/ in my Fedora 26 GNOME 3 system. Actual results: FF Dev Edition defaults to a dark theme, very ugly with the top white bar. Expected results: Dark FF themes should use Dark GTK theme. See https://unix.stackexchange.com/questions/14129/gtk-enable-set-dark-theme-on-a-per-application-basis
Preliminarily moving to Widget: Gtk since I don't think we can currently control this on the front-end side.