But rather than highlighting the security fixes in Firefox 3.6.4, the company instead emphasized the addition of crash protection, a move meant to keep the browser alive when popular plug-ins drop dead.
Updates to Firefox 3.6.4 and Firefox 3.5.10 fixed nine flaws for each version, although the total patch count came to 10 because two fixes affected only one of the pair.
Six of the nine vulnerabilities for each browser were rated "critical," Mozilla's highest threat ranking, indicating that hackers could use them to compromise a system running Firefox, then plant other malware on the machine.
Two were labeled "moderate," the second-lowest rating, while one was tagged as "low."
One of the critical flaws was reported to Mozilla by Nils, a German research who only goes by his first name.
Nils gained fame by winning cash prizes at the last two annual Pwn2Own hacking contests, sponsored by HP TippingPoint's Zero Day Initiative bug bounty program.
It was Nils' second Pwn2Own victory; last year he grabbed $15,000 by exploiting not only Firefox, but also Safari and IE8.
But Mozilla wanted all eyes on Firefox 3.6.4 for a different reason. "Results from our beta testing show Firefox 3.6.4 will significantly reduce the number of Firefox crashes experienced by users who are watching online videos or playing games," said Christian Legnitto, who oversees the Firefox releases, in a post to Mozilla's blog.
"When a plug-in crashes or freezes while using Firefox, users can enjoy uninterrupted browsing by simply refreshing the page," he said.