An updated operating system is a cornerstone of security. Mozilla Firefox 50 released a few days ago is now available in the Ubuntu repos. My system is configured to update automatically. If you check your logs (e.g. /var/log/syslog) regularly, you probably noticed that Ubuntu checks for available updates several times within the day. I got my notification that a new version is available right from the Firefox browser. No problem I just restart the browser. The browser is a critical piece of software as it is the primary tool we use to connect to networks including the Web. Updating it as soon as possible is important to security overall. Every update brings security patches, performance enhancements and new features.