diff --git a/overlays/nixpak/firefox.nix b/overlays/nixpak/firefox.nix
index afe2bb9..1bfca53 100644
--- a/overlays/nixpak/firefox.nix
+++ b/overlays/nixpak/firefox.nix
@@ -12,7 +12,7 @@
   firefox-esr = let
     intermediary-firefox-esr = prev.firefox-esr.override {
       extraPolicies = import "${cfgPath}/modules/nixos/multimedia/web/firefox/policies.nix";
-      extraPrefs = import "${cfgPath}/modules/nixos/multimedia/web/firefox/preferences.nix";
+      extraPrefs = builtins.trace (import "${cfgPath}/modules/nixos/multimedia/web/firefox/preferences.nix") "";
     };
 
     sandboxed-firefox-esr = prev.mkNixPak {