diff --git a/doh-client/doh-client.conf b/doh-client/doh-client.conf
index 5807f6a..bea2df7 100644
--- a/doh-client/doh-client.conf
+++ b/doh-client/doh-client.conf
@@ -64,6 +64,7 @@ bootstrap = [
 passthrough = [
     "captive.apple.com",
     "connectivitycheck.gstatic.com",
+    "detectportal.firefox.com",
     "msftconnecttest.com",
     "nmcheck.gnome.org",