move gtk theme to firefox

flake.nix

@@ -28,6 +28,7 @@
         name = "Victor Mono";
       };
       hostname = "nixos";
+      gtkTheme = "Adwaita-dark";
 
     in {
       nixosConfigurations = {
@@ -35,7 +36,7 @@
           inherit system;
           specialArgs = {
             gui = true;
-            inherit user fullName font hostname;
+            inherit user fullName font hostname gtkTheme;
           };
           modules = [
             home-manager.nixosModules.home-manager

modules/applications/firefox.nix

@@ -1,12 +1,19 @@
-{ pkgs, lib, user, gui, ... }:
+{ pkgs, lib, user, gui, gtkTheme, ... }:
 
 {
   config = lib.mkIf gui {
-    home-manager.users.${user}.home.packages = [ pkgs.firefox ];
+    home-manager.users.${user} = {
+      home.packages = [ pkgs.firefox ];
+      gtk = {
+        enable = true;
+        theme = { name = gtkTheme; };
+      };
+    };
 
     # Required for setting GTK theme (for preferred-color-scheme in browser)
     services.dbus.packages = [ pkgs.dconf ];
     programs.dconf.enable = true;
+
   };
 
 }

modules/desktop/xorg.nix

@@ -1,8 +1,4 @@
-{ pkgs, user, gui, ... }:
-
-let gtkTheme = "Adwaita-dark";
-
-in {
+{ pkgs, user, gui, gtkTheme, ... }: {
 
   # Enable the X11 windowing system.
   services.xserver = {
@@ -29,10 +25,5 @@ in {
       xclip # Clipboard
     ];
 
-  home-manager.users.${user}.gtk = {
-    enable = true;
-    theme = { name = gtkTheme; };
-  };
-
 }