Avoid possible infinite recursion

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/user/configs/gui/firefox/default.nix

@@ -1,9 +1,17 @@
 {
-  user ? throw "user argument is required",
+  username ? throw "username argument is required",
 }:
-{ lib, pkgs, ... }:
 {
-  home-manager.users.${user.name} = {
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  userConfig = config.users.users.${username};
+in
+{
+  home-manager.users.${username} = {
     programs.firefox = {
       enable = true;
 
@@ -122,8 +130,8 @@
     wayland.windowManager.hyprland.settings.bind = [ "$mod, b, exec, ${lib.meta.getExe pkgs.firefox}" ];
 
     home.persistence = {
-      "/persist${user.home}".directories = [ ".mozilla" ];
-      "/cache${user.home}".directories = [ ".cache/mozilla" ];
+      "/persist${userConfig.home}".directories = [ ".mozilla" ];
+      "/cache${userConfig.home}".directories = [ ".cache/mozilla" ];
     };
   };
 }