Mozilla raises Firefox security bar

Touts anti-malware site blocker, 'holistic' security as key additions to Firefox 3.0

Firefox 3.0's new anti-malware blocker, a tool that prevents some malicious pages from loading, is the browser upgrade's most important new security feature, Mozilla's head of engineering said.

Officially dubbed Malware Protection, the tool warns users when they steer Firefox to sites that are known to install viruses, spyware, Trojan horses and other malicious code. When a user tries to reach a site on the banned list, a large red warning appears in lieu of the page. The warning says that the intended destination, "has been reported as an attack site and has been blocked based on your security preferences." A button labeled "Get me out of here!" returns Firefox to the browser's home page.

"Anti-malware is an evolution of Firefox 2.0's anti-phishing," said Mike Schroepfer, Mozilla's vice president of engineering, who said it was his first pick as Firefox 3.0's most important security addition. "This is part of our active defenses," he said.

"It's actually quite difficult to do this kind of checking well," Schroepfer said. "You have to stop a page load before it happens. And you have to be conscious of performance because the browser is doing extra work." Firefox 3.0, he said, runs its checks "without impacting performance at all."

Like the anti-phishing blocker found in Firefox 2.0, the anti-malware tool relies on a list generated by Google, the search company that provides most of Mozilla's revenues. Firefox 3.0 users can choose to have the browser either download an updated blacklist daily, or query Google in real time for each page it tries to pull up.

"It's based on a blacklist," confirmed Schroepfer. "We're pulling that data similarly to anti-phishing, checking the site against that [black]list and then putting up the malware warning if necessary."

The blacklist originates with the tests Google runs on sites it crawls for its search index. Some of the criteria Google users to finger a site as dangerous -- and deserving a spot on the blacklist -- are based on findings by, a group created by Google, Chinese computer maker Lenovo and Sun Microsystems. Google's made it clear, however, that it also applies its own criteria and procedures, and relies on its own tools to spot sites that host or distribute malware.

Firefox's anti-malware tool first made news, when developers posted information on the feature in Bugzilla, the management system Mozilla uses to track changes in its software. At the time, Window Snyder, Mozilla's chief security officer, refused to commit to getting the tool into Firefox 3.0. By September, however, the anti-malware blocker had been added to one of the Firefox 3.0 alpha builds.

Other security improvements in Firefox 3.0, said Schroepfer, include additional clues about where the browser is really pointed. Touted as "one-click site info" in the Beta 3 release notes, the feature lets users see the true owner of the site and whether the connection is encrypted when they click on the "favicon," the icon at the far left of the address bar. Firefox also supports Extended Validation (EV) SSL certificates, and shows sites using the souped up EVs by turning the favicon section of the bar green.

But as he ticked off Firefox 3.0's security enhancements, Schroepfer also claimed that Firefox was more secure than its rivals, new features or not.

"We're one of the fastest to patch," he said, "and we patch even when the bug is not in our software, but [also] when we can mitigate [the problem] by patching around the issue."

As examples of the latter, he cited instances last year when Mozilla updated Firefox to secure the browser against what it then argued was a bug in Microsoft Windows. In October 2007, as it patched Windows XP and Server 2003, Microsoft acknowledged that some of the summer's protocol handler vulnerabilities, including one that Mozilla patched in late July with Firefox, were actually its responsibility.

Schroepfer also trumpeted Mozilla's attention to software updates as a security plus. The open-source browser has long checked for its own updates, and for updates to any extensions, or add-ons, that the user has installed. But in Firefox 3.0, it also checks for updates to installed plug-ins, such as those for QuickTime, Java, Flash and other technologies. (As of Beta 3, the button marked "Find Updates" is grayed out and cannot be clicked, however.)

"One of the biggest security problems users face is running old [and insecure] versions of plug-ins," said Schroepfer. When the feature's enabled -- Schroepfer wasn't available late today to answer questions about that timing -- Firefox will check at least once a day for its own updates, as well as those for any installed themes, extensions and plug-ins.

"I think we're holistic," said Schroepfer in describing the newest beta's security strategy. "You have to look at [security] with an integrated approach."

Firefox 3.0 Beta 3 can be downloaded for Windows, Mac OS X and Linux in 32 languages from Mozilla's site.

Join the Good Gear Guide newsletter!

Error: Please check your email address.

Our Back to Business guide highlights the best products for you to boost your productivity at home, on the road, at the office, or in the classroom.

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

Gregg Keizer

Show Comments

Most Popular Reviews

Latest News Articles


PCW Evaluation Team

Azadeh Williams

HP OfficeJet Pro 8730

A smarter way to print for busy small business owners, combining speedy printing with scanning and copying, making it easier to produce high quality documents and images at a touch of a button.

Andrew Grant

HP OfficeJet Pro 8730

I've had a multifunction printer in the office going on 10 years now. It was a neat bit of kit back in the day -- print, copy, scan, fax -- when printing over WiFi felt a bit like magic. It’s seen better days though and an upgrade’s well overdue. This HP OfficeJet Pro 8730 looks like it ticks all the same boxes: print, copy, scan, and fax. (Really? Does anyone fax anything any more? I guess it's good to know the facility’s there, just in case.) Printing over WiFi is more-or- less standard these days.

Ed Dawson

HP OfficeJet Pro 8730

As a freelance writer who is always on the go, I like my technology to be both efficient and effective so I can do my job well. The HP OfficeJet Pro 8730 Inkjet Printer ticks all the boxes in terms of form factor, performance and user interface.

Michael Hargreaves

Windows 10 for Business / Dell XPS 13

I’d happily recommend this touchscreen laptop and Windows 10 as a great way to get serious work done at a desk or on the road.

Aysha Strobbe

Windows 10 / HP Spectre x360

Ultimately, I think the Windows 10 environment is excellent for me as it caters for so many different uses. The inclusion of the Xbox app is also great for when you need some downtime too!

Mark Escubio

Windows 10 / Lenovo Yoga 910

For me, the Xbox Play Anywhere is a great new feature as it allows you to play your current Xbox games with higher resolutions and better graphics without forking out extra cash for another copy. Although available titles are still scarce, but I’m sure it will grow in time.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?