Browser Battle 2011: Who Is the New King of the Web?
Mozilla Firefox 4

Still the best option for power users
Firefox is an open-source alternative to Microsoft’s proprietary browser, and like Russell. Crowe in Gladiator, Firefox has been winning the crowd ever since it stepped into the ring. Mozilla had just released its first Release Candidate of Firefox 4 when we put this story together, so that’s what we used for testing. The final version should be out by the time you read this.
What’s New?
Mozilla completely overhauled the user interface in Firefox 4 with the intention of making it sleeker and easier to use. It’s the biggest aesthetic update since Firefox first came out, and a welcome one if you appreciate less clutter. All the menu items are neatly tucked away and accessible via a single Firefox button in the upper left corner.

New features abound, like the ability to sync your browser settings across multiple devices, multitouch support in Windows 7, and a new tabbed interface drawing inevitable comparisons to Chrome. The Add-On Manager now opens in a tab, too.
Security
As you might expect, Firefox 4 is the most secure version of Firefox yet. It’s also the least glamorous topic because many of the safeguards that keep the bad guys away work silently in the background. One of the biggest new security safeguards is a new feature called HTTP Strict Transport Security. This is supposed to prevent man-in-the-middle attacks that hijack regular HTTP connections and make them appear as HTTPS, like when logging into a banking institution using an untrustworthy network (think of a public Wi-Fi hotspot). Support in Firefox is only half of the equation; HSTS also requires websites to play ball.

Privacy
Firefox’s Private Browsing mode is left largely unchanged in Firefox 4, which means you can’t run an incognito session and a regular session simultaneously like you can in Chrome, even if you have multiple browser windows open. Firefox does, however, restore your regular session when you’re finished, um, looking up anniversary gifts (that is why you use Private Browsing, right?).
There’s a new Do Not Track feature receiving tons of hype. When enabled (found under Options > Advanced), Firefox sends a header to websites telling them you don’t want to be followed. It’s a neat idea, but still relies on the honor system; a website can choose to blatantly ignore your request.
Performance
Midway through Firefox 4’s development, Mozilla injected the browser with its JägerMonkey JavaScript engine, a wise move considering that earlier betas of the next-generation browser felt sluggish and were getting slammed in the enthusiast community. In its current form, Firefox 4 runs and feels much faster than its predecessor, though it still isn’t as nimble as Chrome in JavaScript heavy tasks. But unlike Chrome, Firefox boasts hardware acceleration, tapping into your GPU to boost performance when rendering graphics heavy tasks. Chrome will address this in version 11, but for the time being, the advantage belongs to Firefox (and IE9).
Power User Tips
1. To quickly view pages you’ve recently visited, right-click the left and/or right arrow(s).
2. Is your favorite Firefox 3.6 add-on blocked in FF4? Type about:config in the address bar. Right-click and select New > Boolean, and enter extensions.checkCompatibility.4.0. Select False for the value.

3. Miss the menu bar? Bring it back by pressing Alt > View > Toolbars > Menu Bar.

Opera 11

The Opera browser finally sings with add-ons
One of the great innovators in the browser space, Norwegian software maker Opera Software has been in the browser business for 14 years, either inventing or popularizing forward-thinking concepts that we take for granted today, like tabbed browsing. This time around, Opera 11, which we’re reviewing in final form, plays catch-up to the other browsers in this roundup.
What’s New?
Given Opera Software’s long history of blazing a trail in browser development, it’s a bit ironic that Opera is one of the last browsers to adopt extensions, which are finally included here in the latest build. At the time of this writing, there were just 446 add-ons to choose from, though that’s 446 more than were available for Opera 10. We also find it interesting that Opera is just now getting around to adding predictive text queries, known as search suggestions. Opera 11 also introduces tab stacking, allowing you to plop tabs on top of each other in manageable groups, as well as visual mouse gestures—a handy cheat sheet appears when you hold the right mouse button.

Security
Opera 11 makes intelligent use of the address field to give users a quick rundown of a website’s security. When visiting a site, most of the URL is grayed out or hidden, save for the main domain. In addition, security badges are color-coded, with yellow for secure, green for trusted, blue for Opera’s Turbo mode, and gray for the rest. Clicking these badges reveals a site’s encryption level and whether or not it has a clean security record.
Privacy
The option to open a private browsing session is buried deeper than in the other browsers here (Menu > Tabs and Windows > New Private Window), but once you find it, you’ll also see an option to open a private tab. And when installing extensions, two privacy checkboxes let you choose whether or not to allow them to interact with secure pages and/or private tabs.
Performance
Hardware acceleration isn’t being introduced until version 11.5, so already Opera’s a bit behind the performance curve compared to some of the competition. But what version 11 lacks in GPU-assisted rendering, it makes up for in JavaScript performance and overall pep. Subjectively, browsing just feels fast, and objectively Opera 11’s benchmark scores were competitive. Sadly, performance in some cases comes at the cost of compatibility, such as the inability to use Google’s Instant Search for search queries or Instant Scrolling for images.

Next Page: Safari 5, the performance benchmarks, and we declare a winner!