Download the super-speedy Firefox Quantum beta today

Delia Watkins
September 28, 2017

Since then, our engineering team has been relentless in their focus on making Firefox incredibly fast.

Firefox has been on an upswing during the past year, recouping 4.6 percentage points of user share - as measured by analytics vendor Net Applications - in the last 12 months. You have multiple options as of right now - Chrome, Firefox, Brave, and Safari - but most people either use Chrome, Safari or IE.

Mozilla has numbered, but never named, its Firefox releases.

Mozilla says Quantum will scale across your CPUs, if you have a modern CPU that extends over a few cores.

Turns out you can measure Firefox Quantum's speed, too - our pit crew is kind of obsessed with a data-driven approach.

Mozilla has unveiled Firefox Quantum, its next-generation browser.

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Webpagetest running on Acer Aspire E15. According to the Speedometer 2.0 benchmark, Firefox Quantum is about 2X faster than Firefox was a year ago. That changes with Quantum as it takes advantage of the multiple CPU cores in today's desktops and mobile devices much more effectively. This improved utilization of your computer's hardware makes Firefox Quantum dramatically faster. The browser's CSS engine has been rewritten in the systems coding lingo to be both faster and better able to multi-thread.

The key advantage of Firefox over Quantum as the eponymous predecessor, and over its closest competitors, is more sparing use of browser memory.

The browser's "autoscrolling" feature now uses asynchronous scrolling, similar to other input methods like mousewheel, providing a smoother scrolling experience.

In other changes, Firefox now prioritizes active tabs so that these download and run before other tabs that are open in the background. Officially designated version 57, the release has also been given the Quantum name, said Nguyen, to "convey the magnitude of the changes" in the browser.

The new Firefox revamps includes lots of under-the-covers improvements like Quantum Flow, which stamps out dozens of performance bugs and Quantum CSS, aka Stylo, which speeds up website formatting. We're confident that with Photon, Firefox Quantum users will be impressed by the modern new design that puts their needs first. Photon on a Windows PC with a touch display, for example, adjusts the menu size based on whether you click with a mouse or touch with a finger. Pocket was acquired by Mozilla previous year and it will be integrated into Firefox 57. When you open a new tab, you'll see now trending web pages recommended by Pocket users in addition to your top sites.

The final version of Quantum will be available on 14 November. Firefox Quantum's Developers Beta is available for Windows, MacOS as well as Linux, along with test versions available for Android and iOS as well. There's also a screenshot tool that generates a site link so you can share what you see on the web with your friends through email or Twitter.

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