diff --git a/src/test/XSS_test.js b/src/test/XSS_test.js
index 99cbb3d..3ec798c 100644
--- a/src/test/XSS_test.js
+++ b/src/test/XSS_test.js
@@ -1,4 +1,4 @@
-{
+if (UA.isMozilla) {
   let y = async (url, originUrl = '') => await XSS.maybe({originUrl, url, method: "GET"});
   let n = async (...args) => !await y(...args);
   Promise.all([