Mozilla re-patches Firefox after regression bug pops up

Bug in last week's Firefox 3.0.9 crashes Windows browser

Mozilla Corp. Monday rushed out a new version of Firefox to fix a flaw it introduced with the 12-patch security update it shipped less than a week ago.

Firefox 3.0.10, which the open-source browser maker called a "security and stability" release, follows Firefox 3.0.9 by just six days, and was necessary because of a new bug that slipped into last week's update.

Mozilla labeled the new bug a critical security vulnerability. "One of the security fixes in Firefox 3.0.9 introduced a regression that caused some users to experience frequent crashes," the accompanying advisory said. "In analyzing this crash, we discovered that it was due to memory corruption similar to cases that have been identified as security vulnerabilities in the past."

The flaw, which cropped up only in the Windows version of Firefox, was detected by Mozilla's crash reporting system, and by last Wednesday, developers were discussing how to deal with the problem on Bugzilla, the company's bug tracking system.

"So we fixed [bug] 431260, which wasn't really a security problem, and we introduced this bug, which probably is," said Robert O'Callahan, a Mozilla developer who works on Firefox's rendering engine. "Perhaps we need to be more picky about what we land on branch."

By Thursday, a patch had been created and the new build had been passed on to testing.

This isn't the first time that Mozilla has had to deal with a regression bug, one that its own developers introduced while making other fixes. Two different times in late 2007, Mozilla released emergency updates to patch such bugs.

Firefox 3.0.10 can be downloaded for Windows, Mac OS X and Linux from the Mozilla site. Current users can also call up their browser's built-in updater or wait for the automatic update notification, which should pop up in the next 48 hours.

According to Mike Beltzner, director of Firefox, Mozilla also plans to post the delayed Firefox 3.5 Beta 4 later night.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags firefox 3.0mozillasecurity patch

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.
Gregg Keizer

Gregg Keizer

Computerworld
Show Comments

Cool Tech

Toys for Boys

Family Friendly

Stocking Stuffer

SmartLens - Clip on Phone Camera Lens Set of 3

Learn more >

Christmas Gift Guide

Click for more ›

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Aysha Strobbe

Microsoft Office 365/HP Spectre x360

Microsoft Office continues to make a student’s life that little bit easier by offering reliable, easy to use, time-saving functionality, while continuing to develop new features that further enhance what is already a formidable collection of applications

Michael Hargreaves

Microsoft Office 365/Dell XPS 15 2-in-1

I’d recommend a Dell XPS 15 2-in-1 and the new Windows 10 to anyone who needs to get serious work done (before you kick back on your couch with your favourite Netflix show.)

Maryellen Rose George

Brother PT-P750W

It’s useful for office tasks as well as pragmatic labelling of equipment and storage – just don’t get too excited and label everything in sight!

Cathy Giles

Brother MFC-L8900CDW

The Brother MFC-L8900CDW is an absolute stand out. I struggle to fault it.

Luke Hill

MSI GT75 TITAN

I need power and lots of it. As a Front End Web developer anything less just won’t cut it which is why the MSI GT75 is an outstanding laptop for me. It’s a sleek and futuristic looking, high quality, beast that has a touch of sci-fi flare about it.

Emily Tyson

MSI GE63 Raider

If you’re looking to invest in your next work horse laptop for work or home use, you can’t go wrong with the MSI GE63.

Featured Content

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?