diff --git a/flake.nix b/flake.nix
index adda46f..c7af3f4 100644
--- a/flake.nix
+++ b/flake.nix
@@ -71,6 +71,23 @@
     in
     flake-parts.lib.mkFlake { inherit inputs; } {
       systems = flake-utils.lib.defaultSystems;
+      perSystem = (
+        { pkgs, system, ... }@args:
+        {
+          _module.args.pkgs = import inputs.nixpkgs {
+            inherit system;
+            config = {
+              allowUnfree = true;
+            };
+          };
+          packages = import ./pkgs (
+            args
+            // {
+              inherit inputs;
+            }
+          );
+        }
+      );
       flake =
         {
           nix.settings = {
diff --git a/home/david/configurations/Tytonidae/firefox.nix b/home/david/configurations/Tytonidae/firefox.nix
index 25c2c32..f85ac31 100644
--- a/home/david/configurations/Tytonidae/firefox.nix
+++ b/home/david/configurations/Tytonidae/firefox.nix
@@ -1,4 +1,10 @@
-{ pkgs, inputs, ... }:
+{
+  pkgs,
+  inputs,
+  outputs,
+  system,
+  ...
+}:
 {
   programs.firefox = {
     enable = true;
@@ -9,13 +15,9 @@
     profiles.default = {
       name = "default";
       isDefault = true;
-      extensions =
-        let
-          addons = (pkgs.callPackage inputs.firefox-addons { }).firefox-addons;
-        in
-        [
-          addons.immersive-translate
-        ];
+      extensions = [
+        outputs.packages."${system}".immersive-translate
+      ];
       search = {
         force = true;
         default = "DuckDuckGo";
diff --git a/pkgs/default.nix b/pkgs/default.nix
index 535d998..63219be 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -1,7 +1,9 @@
 {
-  pkgs ? (import ./../nixpkgs.nix) { },
+  pkgs,
+  inputs,
   ...
 }:
 {
-  # example = pkgs.callPackage ./example.nix { };
+  immersive-translate =
+    (pkgs.callPackage "${inputs.firefox-addons}/default.nix" { }).firefox-addons.immersive-translate;
 }