Firefox 21 contains security fixes, new "Health Report" feature

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Oracle lays out Java security facelift
Oracle lays out Java security facelift

Mozilla has updated its Firefox web browser to repair 13 vulnerabilities.

The update to version 21.0 included eight fixes, three of which were deemed "critical" because they could lead to remote code execution if they were exploited. Those addressed memory corruption, memory safety and use-after-free weaknesses.

The fresh version, released on Tuesday, also includes a "Health Report" capability that will provide users with insight into how their browser is performing.

"[It's] a new system we've built to log basic health information about your browser (time to start up, total running time, number of crashes), and then give you tools to understand that information and fix any problems you encounter," blogged Johnathan Nightingale, VP of Firefox engineering. "The initial report is pretty simple, but it will evolve and grow in the coming months. You'll be able to use it as a window into many aspects of your browser's performance and health, both in absolute terms, as well as in comparison to the global Firefox user base."

The report is available in the browser's "Help" menu.

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