diff --git a/overlays/nixpak/firefox.nix b/overlays/nixpak/firefox.nix
index bb4fbb6..6141712 100644
--- a/overlays/nixpak/firefox.nix
+++ b/overlays/nixpak/firefox.nix
@@ -76,10 +76,14 @@
     };
   in
     sandboxed-firefox-esr.config.env.overrideAttrs (old: {
-      override = args: sandboxed-firefox-esr.config.env.override (old: {
-        extraPrefsFiles = args.extraPrefsFiles or old.extraPrefsFiles or [];
-        nativeMessagingHosts = args.nativeMessagingHosts or old.nativeMessagingHosts or [];
-        inherit (args) cfg;
-      });
+      passthru = (old.passthru or {}) // {
+        browserName = "firefox";
+        enableOfficialBranding = true;
+        override = args: sandboxed-firefox-esr.config.env.override (old: {
+            extraPrefsFiles = args.extraPrefsFiles or old.extraPrefsFiles or [];
+            nativeMessagingHosts = args.nativeMessagingHosts or old.nativeMessagingHosts or [];
+            inherit (args) cfg;
+        });
+      };
     });
 }