Holes associated with a full 14 security advisories were closed in the new Firefox 16, in fact, 11 of them rated "critical."

Also notable about Firefox 16 are features including a new developer toolbar, early Web app support, preliminary VoiceOver support in the Mac OS X version, and a new Reader Mode in the .

Among the fixed by Firefox 16 are memory corruption and memory safety hazards, a buffer overflow bug, and a spoofing and script-injection flaw.

Most were also corrected in 16 and SeaMonkey 2.13, both of which were released on Tuesday as well, in addition to being backported to the business-oriented of Firefox and Thunderbird.