Mozilla has released patches for 30 vulnerabilities in Firefox 18, the newest version of its web browser. According to a Firefox Security Advisories report, 21 of the flaws are deemed “critical,” giving attackers the opportunity to run malicious code and “install software, requiring no user interaction beyond normal browsing.” Released Tuesday, Firefox 18 provides a 25 percent boost in speed enhanced by Mozilla's new JavaScript engine, IonMonkey, the company said. Meanwhile, the update added new security features to the Firefox Android app, including a warning system for users who may be visiting a malicious site.