diff --git a/nixos/cesium.nix b/nixos/cesium.nix
index 5b31c80..0c971be 100644
--- a/nixos/cesium.nix
+++ b/nixos/cesium.nix
@@ -12,4 +12,6 @@
   hardware.graphics = {
     enable = true;
   };
+
+  networking.firewall.allowedTCPPorts = [ 9003 ];
 }
diff --git a/nixos/home.nix b/nixos/home.nix
index 62bb67f..1a08c4d 100644
--- a/nixos/home.nix
+++ b/nixos/home.nix
@@ -43,6 +43,7 @@ in
     # Entwicklung
     jetbrains-toolbox
     mkcert
+    nssTools
     gitflow
     claude-code
     gnomeExtensions.claude-code-usage-indicator