diff --git a/overlays/nixpak/firefox.nix b/overlays/nixpak/firefox.nix
index 4653f5e..c149eda 100644
--- a/overlays/nixpak/firefox.nix
+++ b/overlays/nixpak/firefox.nix
@@ -3,10 +3,10 @@
 # https://github.com/schizofox/schizofox/blob/cdf69b2a445ff12680657a3bd44ce7c406bf2ae6/flake/modules/home-manager/default.nix
 
 { ... }: final: prev: {
-  firefox-esr = let
+  firefox-esr = { cfg, ... }: let
     sandboxed-firefox-esr = prev.mkNixPak {
       config = { sloth, ... }: {
-        app.package = prev.firefox-esr;
+        app.package = prev.firefox-esr.overrides cfg;
         app.binPath = "bin/firefox-esr";
         flatpak.appId = "org.mozilla.firefox";