diff --git a/firefox.js b/firefox.js
index e6a0785..916521f 100644
--- a/firefox.js
+++ b/firefox.js
@@ -8,6 +8,9 @@ user_pref("ui.context_menus.after_mouseup", true);
 // Don't display menubar when pressing Alt
 user_pref("ui.key.menuAccessKeyFocuses", false);
 
+// Dark theme
+user_pref("ui.systemUsesDarkTheme", 1);
+
 // No popup at all!
 user_pref("browser.link.open_newwindow.restriction", 0);
 
diff --git a/rc/appearance.lua b/rc/appearance.lua
index 4897814..f9d5173 100644
--- a/rc/appearance.lua
+++ b/rc/appearance.lua
@@ -6,7 +6,7 @@ beautiful.init(awful.util.getdir("config") .. "/rc/theme.lua")
 -- avoid duplication.
 local gtk2 = io.open(os.getenv("HOME") .. "/.gtkrc-2.0", "w")
 gtk2:write([[
-gtk-theme-name="Adwaita"
+gtk-theme-name="Adwaita-dark"
 gtk-icon-theme-name="Adwaita"
 gtk-cursor-theme-name="Adwaita"
 gtk-cursor-theme-size=0
@@ -95,7 +95,7 @@ qt5ct:write([[
 custom_palette=false
 icon_theme=Adwaita
 standard_dialogs=gtk3
-style=Adwaita
+style=Adwaita-dark
 
 [Fonts]
 fixed=@Variant(\0\0\0@\0\0\0 \0\x44\0\x65\0j\0\x61\0V\0u\0 \0S\0\x61\0n\0s\0 \0M\0o\0n\0o@$\0\0\0\0\0\0\xff\xff\xff\xff\x5\x1\0\x32\x10)
diff --git a/xsettingsd b/xsettingsd
index 536b90a..cf86010 100644
--- a/xsettingsd
+++ b/xsettingsd
@@ -2,7 +2,7 @@
 Xft/Antialias 1
 Xft/Hinting 1
 Xft/HintStyle "hintslight"
-Net/ThemeName "Adwaita"
+Net/ThemeName "Adwaita-dark"
 Net/IconThemeName "Adwaita"
 Gtk/CursorThemeName "Adwaita"
 Gtk/CursorThemeSize 0