What are some potential reasons for a website to block requests from certain browsers?

Some potential reasons for a website to block requests from certain browsers could include security concerns, compatibility issues, or to prevent spam or malicious activity. To solve this issue, you can use user agent detection to identify the browser making the request and then allow or block access based on that information. 

$user_agent = $_SERVER['HTTP_USER_AGENT'];

if (strpos($user_agent, 'Firefox') !== false) {
    // Allow access for Firefox browser
    // Your code here
} else {
    // Block access for other browsers
    header('HTTP/1.1 403 Forbidden');
    exit('Access denied');
}

Keywords

user-agent browser detection HTTP headers user-agent string browser compatibility

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