diff --git a/modules/nixos/multimedia/web/firefox/preferences.nix b/modules/nixos/multimedia/web/firefox/preferences.nix
new file mode 100644
index 0000000..dbe0df3
--- /dev/null
+++ b/modules/nixos/multimedia/web/firefox/preferences.nix
@@ -0,0 +1,3 @@
+{
+  "browser.urlbar.suggest.topsites" = false;
+}
diff --git a/overlays/nixpak/firefox.nix b/overlays/nixpak/firefox.nix
index 0e11b84..afe2bb9 100644
--- a/overlays/nixpak/firefox.nix
+++ b/overlays/nixpak/firefox.nix
@@ -2,11 +2,17 @@
 # https://github.com/ryan4yin/nix-config/blob/7deed26cc5a3af2072b8c89a688f265607babc80/hardening/nixpaks/firefox.nix
 # https://github.com/schizofox/schizofox/blob/cdf69b2a445ff12680657a3bd44ce7c406bf2ae6/flake/modules/home-manager/default.nix
 
+# NOTE: This overlay package is not compatible with the `programs.firefox` module
+#       for both NixOS and home-manager. If you want to modify the configuration of
+#       Firefox, you have to do it through modifying the overrides for the intermediary
+#       package below. This configuration already sets sane defaults so it shouldn't be needed
+#       but it is there in case you want it.
+
 { cfgPath, ... }: final: prev: {
   firefox-esr = let
     intermediary-firefox-esr = prev.firefox-esr.override {
       extraPolicies = import "${cfgPath}/modules/nixos/multimedia/web/firefox/policies.nix";
-      # TODO: extaPrefs set browser.urlbar.suggest.topsites = false
+      extraPrefs = import "${cfgPath}/modules/nixos/multimedia/web/firefox/preferences.nix";
     };
 
     sandboxed-firefox-esr = prev.mkNixPak {