Mozilla just released Firefox 14, which isn't a huge update but comes with some nice security features. All Google searches are encrypted with HTTPS by default, to keep your information safe from prying eyes.
Firefox 14 also makes it easier to verify a site's identity, which is helpful for avoiding phishing attacks. Lastly, it also supports OS X Lion's native full screen mode for Mac users. Hit the link to read more, or download the new version now.