fix: remove unstable pkgs, change env and firefox settings

Author: danxliu

flake.nix

@@ -106,13 +106,6 @@
       url = "github:ocf/jukebox-django";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-
-    nixpkgs-unstable = {
-      type = "github";
-      owner = "nixos";
-      repo = "nixpkgs";
-      ref = "nixos-unstable";
-    };
   };
 
   outputs =

modules/graphical/default.nix

@@ -148,14 +148,17 @@ in
         ];
 
         environment.sessionVariables = {
-          QT_QPA_PLATFORMTHEME = "qt5ct";
+          QT_QPA_PLATFORMTHEME = "gtk3";
         };
 
         programs.dconf.enable = true;
 
         programs.firefox = {
-          preferences = {
-            "widget.gtk.libadwaita-colors.enabled" = false;
+          policies.Preferences = {
+            "widget.gtk.libadwaita-colors.enabled" = {
+              Value = false;
+              Status = "default";
+            };
           };
         };