Fix: [Extension] Use extension API make sure page open successfully

src/extension/popup.html

@@ -1 +1,13 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+</head>
+<body>
 <script src="./popup.js"></script>
+<a href="./index.html" target="_blank">
+    <button>立即使用</button>
+</a>
+</body>
+</html>
+