The Download Blog

Firefox has a CPU usage issue and, consequently, can cause overheating problems in some laptops, particularly ultraportables. That's what I've found over the last couple of years.

But don't take my word for it. This is documented on a Mozilla support page entitled "Firefox consumes a lot of CPU resources." The page states: "At times, Firefox may require significant CPU [central processing unit] resources in order to download, process, and display Web content." And forum postings like this one about a Dell Netbook are not uncommon: "Mini9 would get way too hot."

The Mozilla support page goes on to say that "you can review and monitor CPU usage through specific tools" and describes ways to limit CPU usage, such as: "A Firefox add-on, called Flashblock, allows you to selectively enable and disable Flash content on Web sites."

Let me describe my experience. I find that tab for tab, Firefox uses decidedly more resources than other browsers--Safari, for example. And in the past (when I was actively using a Windows Vista-based machine) Firefox also compared unfavorably with Microsoft's Internet Explorer for CPU usage.

More specifically, here's the behavior as I see it. When I'm accessing sites with multimedia content such as the CNET front door, Firefox CPU usage will bounce around between 30 and 60 percent, and sometimes spike higher (80 percent and above), as indicated by the Mac OS 10.6.2 Activity Monitor.

On the other hand, the Safari CPU usage with the same pages open is much lower--typically between 2 percent and 10 percent.

My theory is that most users don't notice this because in mainstream laptops, this isn't an issue. But it can become an issue in ultraportables--typically under an inch thick--which are more sensitive to heat because of the design constraints. The ultrathin Apple MacBook Air, which I use as my main machine, is a good example.

The fan is usually an audible indicator of CPU usage issues. When I'm using Firefox and I have tabs open on multimedia-rich sites (which is par for the course these days), the Air's fan will almost invariably kick on and stay on until I close the tabs. As I write this, the fan has finally shut down after I closed the Firefox tabs (e.g, CNET front door). Those same tabs in Safari are still open and not causing any significant spike in CPU usage or fan activity.

When I contacted Mozilla, a technical support person guessed that Safari is possibly better at optimizing Flash-based sites compared to Firefox. And that may be true. However, I had similar issues before when I was using a Hewlett-Packard business ultraportable (also very thin like the Air) that were not necessarily tied to Flash usage. In short, Firefox was less efficient with CPU usage compared to Microsoft's IE 8. And the behavior was similar. The HP laptop would quickly heat up and the fan would kick on.

Finally, let me reemphasize that I'm guessing that most users don't notice this because heat dissipation is not a big issue for mainstream laptops that are not necessarily thermally-challenged when accessing multimedia-rich Web pages. That said, this has been a steady problem for me because I use ultraportables almost exclusively and has forced me to limit my use of Firefox.

The developer preview version of Chrome now promotes an as-yet unworking link to an extensions gallery.

(Credit: Screenshot by Stephen Shankland/CNET)

Google is on the verge of launching a Web site to showcase its extensions to customize what its browser can do.

The company's latest developer preview edition, Chrome 4.0.249.0, promotes the feature on its opening screen and its new-tab page. "New! Google Chrome now has extensions and bookmark sync," the page reads, offering a link to a site that's not public yet, https://chrome.google.com/extensions. (Bookmark sync is already available.)

Extensions and support for Mac OS X and Linux are the headline features of Chrome 4.0. It's available as a beta for Windows, with Mac OS X and Linux beta availability expected in early December. According to the Chromium development calendar, the beta is planned for December 8 release and the stable release of Chrome 4.0 is due January 12.

A number of third-party galleries for Chrome extensions already are available, but programmers for the project have said on mailing lists that a Google site is planned. Earlier this year, Google shipped a version of Chrome that pointed to a collection of visual themes before the Chrome themes gallery was actually live to the public.

Extensions are a key asset of one Chrome competitor, Mozilla's Firefox; extensions permit people to customize the browser and add new features without burdening the overall project. Firefox is getting a new extensions framework, Jetpack, starting with version 3.7 due in the first half of 2010, and Mozilla has just launched its own Jetpack gallery.

Are you happy with your Web browser? Your Mac comes preloaded with Safari (certainly a great browser in its own right), but it never hurts to check out the competition. Mozilla's Firefox is an excellent choice, as is its lightweight made-for-Mac entry, Camino. If you stay connected with social sites, Flock is another great option. The fact is, with so many great choices on the Mac, choosing your browser becomes more a question of style.

Opera is the unsung hero of the Mac browser category, with tons of unique features like Speed Dial (to get to favorite sites), its own spell checker, an integrated e-mail client, and much more. Give it a test drive and you might find that Opera has all the features for your particular surfing style.

Also this week we have Path Finder, the standalone file management tool that acts as a replacement for the Mac OS X Finder. Our game this week is Vendetta Online, the massive multiplayer online RPG where you captain your own ship and explore and battle your way through a huge universe.

Don't forget to check out our iPhone apps of the week!

Google plans to release a Mac beta of Chrome in early December, judging by some chatter on a mailing list for the browser.

Chrome 4.0 is available today as a beta version for Windows but only as a rougher developer-preview version on Linux and Mac OS X. The standout feature of the new version is customization through extensions, a technology that long has been a core asset of another open-source browser, Firefox.

Google has been moving to a new extensions presentation technology called Browser Actions that let people interact with extensions through a small button toward the upper right of the browser window. "We've noticed that many of you have updated your extensions to take advantage of the new UI. We'd like to encourage the rest of you to do so as well," said Nick Baum, a Google Chrome product manager, in a mailing list posting.

But here's the hitch: Browser Actions only work on Windows and Linux right now. That means those building extensions will leave Mac Chrome users behind for a time. But in telling those developers they won't have long to wait, Baum mentioned the deadline for the beta version.

"The earlier you switch, the more time you will have to polish your experience for our Beta launch in early December," he said.

And Google is on the case for adding Browser Actions to the Mac version of Chrome.

"We realize this means dropping Mac support for a couple of weeks, but we already have people working on that," Baum said. "If you prioritize the Windows and Linux versions, we'll bring you cross-platform parity as soon as we can!"

If you run your own Web site or design your own blog, you need a good FTP client to keep your site updated and running smoothly. Fetch has been around for more than a decade as the go-to FTP client for Mac and is a solid and tested option for all your file transferring needs. This latest version fixes bugs and improves on its stability.

Also this week, we have the latest version of Vuze, one of the best BitTorent clients for Mac, featuring the capability to view full HD video from within the software. Our game this week is Sun Blast, a fast-paced 3D arcade shooter in which you'll battle waves of enemies to reach the mothership for the ultimate showdown.

Don't forget to check out our iPhone apps of the week!

Apple on Monday released a large security update for Mac OS X that fixes dozens of vulnerabilities and provides protection against potential attacks exploiting a weakness in the protocol used to verify that a domain is legitimate.

There are 43 specific issues addressed in the 2009-006 update, released the same day as Mac OS X v.10.6.2.

It plugs a variety of holes for the Mac OS X v10.5.8, 10.6, 10.6.1, and Mac OS X Server v10.6 and 10.6.1, many of which could lead to arbitrary code execution and allow an attacker to take control of a computer.

Several updates affect Apache and QuickTime. Others target AFP Client, Apple Type Services, Core Graphics, CoreMedia, Dictionary, Disk Images, Dovecot, Directory Service, fetch mail, FTP Server, Help Viewer, Kernel, PHP, QuickDraw Manager and Spotlight.

One update fixes a hole in Adaptive Firewall that could allow a brute force or dictionary attack to guess an SSH log-in password, and another update addresses a vulnerability in Login Window that could allow a user to log in to any account without supplying a password.

Several updates address holes that could allow domain spoofing or man-in-the-middle attacks involving SSL (Secure Sockets Layer) used for encrypting data in transit, including a significant weakness in the X.509 protocol for generating SSL connections.

One of the updates affects the libsecurity feature and is billed as a "proactive change to protect users in advance of improved attacks against the MD2 hash algorithm" that could expose users to spoofing and information disclosure.

"There are known cryptographic weaknesses in the MD2 hash algorithm. Further research could allow the creation of X.509 certificates with attacker controlled values that are trusted by the system," the update says. "This could expose X.509 based protocols to spoofing, man in the middle attacks, and information disclosure. While it is not yet considered computationally feasible to mount an attack using these weaknesses, this update disables support for an X.509 certificate with an MD2 hash for any use other than as trusted root certificate."

That major weakness was revealed by security researcher Dan Kaminsky at the Defcon hacker conference in July. Kaminsky was able to trick a Certificate Authority into providing a certificate verifying authenticity for a domain that belonged to someone else.

The updates can be downloaded from Apple's site.

Many of you are getting new PCs these days, either as a gift, or just because there's a shiny new operating system out there. But once you get it fired up and the operating system installed, it's time to populate it with good software. Don't just take all the dreck off your old machine people. Use this as an opportunity to start fresh. Let me give you the seven essential pieces of software for your new PC.

First, there's security. You need an antivirus app, and it's not something you need to pay for. CNET's Download.com gave AVG Free Antivirus edition five stars out of five. And if you're not a big company, it won't cost you a dime.

Now that you're protected, it's time to browse the Internet. Don't just go with the Web browser that came with your operating system. There's Opera, and Google Chrome, and Firefox, and so many other options. And you know what? I'm not going with any of them. I recommend Sea Monkey. Why? Because it has the Firefox Web browser, but it also bundles e-mail, an IRC client, and Web page editor as well. If IRC and Web editing doesn't matter to you, then maybe go with Firefox and Thunderbird for e-mail. However, to get the most bang for your byte, I say go Sea Monkey.

Next, you need to tell all your friends of your experience on your new computer. So get an IM client. On Windows, I recommend Pidgin. For Mac use Adium. They both are free, open-source multiservice clients that work great.

Next, it's time to save you a few hundred bucks. Don't go out and drop dough on Microsoft Office. Open Office from Openoffice.org is better than it's ever been. I use it daily for word processing, spreadsheet manipulation, presentations, and more. If you're an Excel superuser, you may have issues with it, but for the average Joe, it's going to do everything you need--for free!

Productivity is covered. Now for some entertainment. For that, you need VLC media player. It can handle almost anything you throw at it. Have DVDs won't play in that piece of crap software that came with your PC? VLC will handle it. Music? Any format you can think of. And it's got that magic price you love.

Two more and we're done.

Now you need a graphics editor. How else will you put your friends heads on celebrity bodies. For Windows there's nothing better than Paint.NET. It's free and powerful. For Mac? It's tough. I like Acorn, which is free to download but $50 to keep. For free that stays free, try Seashore, which is based on the GIMP engine, or Skitch.

Finally, one last security piece of software. Antispyware. You can go with a cocktail of Ad-Aware, Spybot Search and Destory, Windows Defender, and so on. That's not a bad idea, but if I was backed up against a wall and forced to pick just one, I'd pick Hijack This. Trend Micro has given us one of the most powerful malware removal tolls you can find, and it's freeware.

Now there's certainly many other apps you need, such as registry cleaners, torrent downloaders, FTP clients, and so on, but they start to stray into niches that vary for different types of users. I can say without a doubt that these seven programs are essential for you to install on every PC, no matter who you are.

Tom and Rafe discuss the apps they put on first thing when they get a new computer.

Listen now: Download today's podcast

The Dock in Mac OS X acts as a launcher, program switcher, and much more. But if you want more space and flexibility with your main program and file launcher, you might want to try DragThing. This popular and well-tested shareware GUI-enhancer has become an indispensable addition to OS X for many users. If you want a new way to organize your apps and files, this feature-rich utility is the perfect tool.

Also this week we have the latest version of AppDelete, the uninstall utility that helps you get all the files associated with an unwanted app off of your Mac for good. Our game this week is Mad Skills Motocross, a simple side-scrolling motocross game with unique challenges and entertaining gameplay.

Don't forget to check out our iPhone apps of the week!