Mozilla on Monday announced it was postponing the release of Firefox 11, but changed its mind today, saying that the browser upgrade would go out on schedule.
Yesterday, Johnathan Nightingale, senior director of Firefox engineering, said Mozilla was delaying Firefox 11's launch to examine a bug unveiled at last week's Pwn2Own hacking contest and to give developers time to scrutinize Microsoft's security updates, set to release today at approximately 1 p.m. ET.
On the last day of Pwn2Own, a two-man team -- Vincenzo Iozzo and Willem Pinckaers -- exploited a Firefox vulnerability to take the contest's $30,000 second-place prize.
ZDI, which sponsored the Pwn2Own hacking contest that ran March 7-9, reported vulnerabilities used at the event to vendors yesterday.
Originally, Nightingale said that the delay would be "a day or two." Today, he updated his post to a Mozilla blog confirming that the upgrade would go out after all.
"The security bug reported by ZDI is one we had already identified and fixed through our internal processes," said Nightingale. "This eliminates the need for us to delay this week's releases, and we will be shipping them later today."
As for today's Windows security updates -- which Nightingale acknowledged had "interacted badly with our updates before" -- Mozilla was taking a different tack.
"In order to understand the impacts of Microsoft's 'Patch Tuesday' fixes, we will initially release Firefox for manual updates only," Nightingale said today. "Once those impacts are understood, we'll push automatic updates out to all of our users."
Firefox 11 will include the usual security patches, as well as a few new features noticeable to users, such as synchronizing add-ons across all Firefox-equipped machines.
When Mozilla releases Firefox 11, it will be available for downloading from the company's website.
As of 12:30 p.m. ET, Mozilla had not pushed Firefox 11 to its download page, or offered the upgrade to users who manually requested the update.
To trigger the update, Windows users should select "Help" from the Firefox menu at the upper left of the browser window, then pick "About Firefox." Meanwhile, Mac users must choose "About Firefox" from the Firefox menu.
Once Mozilla starts its automatic update process, people already running Firefox will be offered the upgrade through the browser's maintenance mechanism.
Also scheduled to launch today is the next security update to Firefox 3.6, the two-year-old browser that will be retired from support next month.
Pwn2Own was not the only hacking event held last week: At the same time and at the same security conference, Google hosted its inaugural Pwnium challenge where it solicited vulnerabilities and exploits for Chrome. Google paid out $120,000 to two researchers who demonstrated exploits of Chrome and its integrated sandbox.
Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at @gkeizer, on Google+ or subscribe to Gregg's RSS feed . His email address is email@example.com.