Mozilla had some good news and bad news last week. The Mozilla Foundation’s Firefox Web browser on Friday hit the 50 million download mark, which was the good news for the popular alternative to Microsoft’s Internet Explorer. The bad news? Several critical security flaws have been reported by Secunia, an IT security services company that monitors computer security issues. Sound familar? Security flaws are also commonplace on the more popular Microsoft browser. Many security analysts expect Firefox to attract the same unwanted attention as it grows in popularity. According to Secunia, two vulnerabilities found in the increasingly popular browser can be exploited to conduct cross-site scripting attacks and compromise a user’s PC. Cross-site scripting (also known as XSS) occurs when a web application gathers malicious data from a user. Mozilla says that it is working a solution to these potential vulnerabilities and will offer a security update to fix the problems. Meanwhile, Secunia says users can protect against the vulnerabilities by disabling JavaScript. Firefox users can also check out Mozilla update sites which also offers suggestions to head off the problem. Security