<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Firefox Specific CSS</title>
<style>
/* Default styles for box4 */
.box4 {
background-color: green;
width: 100px;
height: 100px;
border-radius: 10px;
}
/* Firefox-specific styles */
.firefox-box4 {
background-color: blue;
width: 150px;
height: 150px;
border-radius: 20px;
}
</style>
</head>
<body>
<div class="box4"></div>
<script>
// Detect Firefox and apply specific class
if (navigator.userAgent.indexOf("Firefox") > -1) {
document.querySelector('.box4').classList.add('firefox-box4');
}
</script>
</body>
</html>