diff --git a/build/js/ox.ui.js b/build/js/ox.ui.js
index 70d963aa..623fac98 100644
--- a/build/js/ox.ui.js
+++ b/build/js/ox.ui.js
@@ -144,6 +144,8 @@ requires
                         return false;
                     }
                 });
+                if (!userAgent && navigator.userAgent.indexOf('Gecko') > -1)
+                    userAgent = 'Firefox';
                 return userAgent;
             }