Titlebar is white

[nschipperbrainsmith]

I'm unsure where to post this (as a new linux user), but I'm experiencing an odd issue. When I install firefox developer edition manually the titlebar is the theme color of elementary OS 0.4.1 but when I install it through flatpack it's the only application which has a white titlebar:

Is their some setting somewhere which I have to modify ?
Besides this I'm also getting an error: "Failed to load module "pantheon-filechooser-module"

[stransky]

I guess thats because flatpak sandboxes the Firefox and uses default Adwaita theme for Firefox and not your chosen theme. But that's my guess only, Jan may know for sure.