diff --git a/content/index.html b/content/index.html
index f2f3aad5..1883933c 100644
--- a/content/index.html
+++ b/content/index.html
@@ -2,7 +2,11 @@
 <html>
   <head>
     <meta charset="utf-8" />
-    <title></title>
+    <title>niconizer overlay window</title>
+    <meta
+      name="content-security-policy"
+      content="default-src 'none'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src *; connect-src 'self'"
+    />
     <link rel="stylesheet" href="style.scss" />
     <script src="script.ts" defer></script>
   </head>
