Mozilla Releases Firefox 4 With Speed Enhancements and New Look

Tuesday March 22, 2011 8:55 am PDT by Eric Slivka

Mozilla today announced the official release of Firefox 4, the latest version of the organization's popular Internet browser, for Mac OS X, Windows, and Linux. With support for over 80 languages, Firefox 4 brings speed enhancements as well as a sleek new user interface, increased customizability, and new security and privacy features.

Firefox 4 is the fastest Firefox yet. With dramatic speed and performance advancements across the board, Firefox is between two and six times faster than previous releases. Major enhancements to the JavaScript engine make everything from startup time to page load speed to graphics and JavaScript performance screaming fast in Firefox.

The latest version of Firefox introduces a sleek new look that lets Web content take center stage. With features like App Tabs and Panorama, Firefox makes it easier and more efficient to navigate the Web. Firefox delivers industry-leading privacy and security features like Do Not Track and Content Security Policy to give users control over their personal data and protect them online.

Firefox 4.0 is of course a free download, with the Mac version requiring a minimum of Mac OS X 10.5 Leopard.

Popular Stories

Report: Tim Cook to Step Down as Apple CEO 'as Soon as Next Year'

Saturday November 15, 2025 2:40 pm PST by Joe Rossignol

Apple is preparing for Tim Cook to step down as CEO of the company "as soon as next year," according to the Financial Times. The company's board of directors and senior executives "recently intensified preparations for Cook to hand over the reins," the report said. While the report said that Apple is unlikely to name a new CEO before its next earnings report in late January, it went on to ...

• 465 comments

Everything New in iOS 26.2 Beta 3

Monday November 17, 2025 3:20 pm PST by Juli Clover

Apple provided developers with the third beta of an upcoming iOS 26.2 update, and there are still new features that are being added with each beta that we get. We've rounded up all of the changes that Apple made in beta 3. AirDrop Apple added new AirDrop functionality, providing a way for two people to share files temporarily without having to add one another as contacts. iOS 26.2...

• 20 comments

Apple Releases New Firmware for AirPods Pro 2, AirPods Pro 3, and AirPods 4

Thursday November 13, 2025 11:35 am PST by Juli Clover

Apple today released new firmware designed for the AirPods Pro 3, the AirPods 4, and the prior-generation AirPods Pro 2. The AirPods Pro 3 firmware is 8B25, while the AirPods Pro 2 and AirPods 4 firmware is 8B21, all up from the prior 8A358 firmware released in October. There's no word on what's include in the updated firmware, but the AirPods Pro 2, AirPods 4 with ANC, and AirPods Pro 3...

• 70 comments

Best Black Friday Apple Deals Live Now - Save on AirPods, iPads, and Apple Watches

Saturday November 15, 2025 1:45 pm PST by Mitchel Broussard

We're officially in the month of Black Friday, which will take place on Friday, November 28 in 2025. As always, this will be the best time of the year to shop for great deals, including popular Apple products like AirPods, iPad, Apple Watch, and more. In this article, the majority of the discounts will be found on Amazon. Note: MacRumors is an affiliate partner with some of these vendors. When ...

• 3 comments

iPhone Driver's License Feature Launching in Illinois

Tuesday November 18, 2025 8:47 am PST by Joe Rossignol

In select U.S. states, residents can add their driver's license or state ID to the Wallet app on the iPhone and Apple Watch, providing a convenient and contactless way to display proof of identity or age at select airports and businesses, and in select apps. Starting this Wednesday, November 19, the feature will be available to residents of Illinois. The announcement confirmed that the...

• 59 comments

iPhone Pocket Now Available to Order, But Already Selling Out

Friday November 14, 2025 6:20 am PST by Joe Rossignol

Apple recently teamed up with Japanese fashion brand ISSEY MIYAKE to create the iPhone Pocket, a limited-edition knitted accessory designed to carry an iPhone. iPhone Pocket is available to order on Apple's online store starting today, in the United States, France, China, Italy, Japan, Singapore, South Korea, and the United Kingdom. However, it is already completely sold out in the United...

• 200 comments

apple silicon mac lineup 2024 feature purple m5

Apple's 2026 Mac Plans

Friday November 14, 2025 3:23 pm PST by Juli Clover

Most of Apple's Macs are slated to get M5 chips across 2026, and there's a possibility we'll even see the first M6 chips toward the end of the year. Updates are planned for everything from the MacBook Air to the Mac Studio. MacBook Air (Early 2026) The MacBook Air will be one of the first Macs to get a 2026 refresh, with an update planned for the first few months of the year. The MacBook...

• 157 comments

Here's When Tesla is Expected to Add Support for Apple CarPlay

Sunday November 16, 2025 6:49 am PST by Joe Rossignol

In his Power On newsletter today, Bloomberg's Mark Gurman reiterated that Tesla plans to add Apple CarPlay support to its vehicles "in the coming months." This is easily the biggest news for the regular version of CarPlay in years, should Tesla actually follow through with offering the system in its vehicles. As noted by Gurman, this would be a stunning reversal for Tesla and its CEO Elon ...

• 114 comments

tvOS 26.2 Adds a Useful New Feature to Your Apple TV

Friday November 14, 2025 10:02 am PST by Joe Rossignol

Starting with the upcoming tvOS 26.2 update, currently in beta, additional profiles created on the Apple TV no longer require their own Apple Account. In the Settings app on the Apple TV, under Profiles and Accounts, anyone can create a new profile by simply entering a name and indicating whether the profile is for a kid. The profile will be associated with the primary user's Apple Account,...

Apple Sports App on iPhone Now Available in More European Countries

Monday November 17, 2025 6:27 am PST by Joe Rossignol

The free Apple Sports app on the iPhone was released in additional European countries today, including Belgium, Croatia, Czechia, the Netherlands, Luxembourg, Poland, Hungary, Denmark, Finland, Norway, Sweden, Switzerland, Slovakia, Slovenia, Serbia, Greece, Estonia, Latvia, Romania, Ukraine, and others. The app was already available in the U.S., the U.K., Canada, Austria, France, Germany,...

• 22 comments

Top Rated Comments

fermat-au

191 months ago

By their support of WebM, FireFox is dead to me.

How does the fact that FireFox supporting WebM impact you negatively in slightest?

What I assume you actually meant was: By them not supporting H264, FireFox is dead to me.. You can still play H264 encoded media via a Quicktime plug-in.

As FireFox is an open source project, Mozilla choose not to ship it with H264 due to it being a patent encumbered codec. People who should be worried about the fact that FireFox supports WebM are Apple. With both FireFox and Google's Chrome supporting WebM, it may become the de facto standard for web video, this would be bad for Apple as they have backed H264.

Score: 1 Votes (Like | Disagree)

Read All Comments