diff --git a/src/popup/index.html b/src/popup/index.html
index ab5f5d55a48..eb38555c823 100644
--- a/src/popup/index.html
+++ b/src/popup/index.html
@@ -1,5 +1,5 @@
-﻿<!DOCTYPE html>
-<html>
+<!DOCTYPE html>
+<html class="__BROWSER__">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
