The release Tuesday of a new version of Mozilla's web browser brought fixes for 13 vulnerabilities, and offered improved browsing security features.

Firefox 20 addresses five "critical" flaws that could allow an attacker to run malicious code or install software “requiring no user interaction beyond normal browsing,” a security advisory from Mozilla said.

The latest version also offers a download panel for easier tracking of files that have been downloaded using Firefox.

Also packaged with the new release is functionality that allows users to change their browsing privacy status, without closing or restarting the browser.