High Quality Content by WIKIPEDIA articles! Browser security is the application of internet security to web browsers to protect computer systems, networks, and data, from malware or breaches of privacy. Browser security exploits often use JavaScript - sometimes with cross-site scripting (XSS) - sometimes with a secondary payload using Adobe Flash, but can also take advantage of many other vulnerabilities (security holes) that are commonly exploited in all browsers; including Mozilla Firefox,Google Chrome,Opera and Microsoft Internet Explorer.