firefoxMozilla yesterday announced the release of Firefox 54 web browser with new multi-process architecture that promises to make browsing with multiple tabs open faster and more stable, especially on computers with 8GB of memory or less.

With the latest release, Firefox uses up to four processes to run web page content across all open tabs. This means that a heavy, complex web page in one tab has a much lower impact on the responsiveness and speed of other tabs, according to Mozilla:

The old Firefox used a single process to run all the tabs in a browser. Modern browsers split the load into several independent processes. We named our project to split Firefox into multiple processes 'Electrolysis' (or E10s) after the chemical process that divides water into its core elements. E10s is the largest change to Firefox code in our history. Besides running faster and crashing less, E10S makes websites feel more smooth. Even busy pages, like Facebook newsfeeds, spool out smoothly and cleanly.

firefox tests
In Mozilla's own tests comparing memory usage for various browsers, it claimed that Firefox used significantly less RAM in macOS than both Safari and Chrome. The group has published an article on Medium explaining how the new E10s architecture works.

In one section titled "Why Chrome gets too hot when Firefox does not", Mozilla writes that Chrome's method of creating separate processes for each open tab can end up with each one consuming hundreds of megabytes of RAM, whereas Firefox reuses processes and content engines to limit memory usage.

By default, Firefox now creates up to 4 separate processes for web page content. So, your first 4 tabs each use those 4 processes, and additional tabs run using threads within those processes. Multiple tabs within a process share the browser engine that already exists in memory, instead of each creating their own.

Mozilla claims that Firefox's considerate memory usage means users with 8GB of memory or less can browse the web without the browser hogging resources, allowing them to do other things on their computer. Meanwhile, users with more than 8GB of RAM can bump up the number of content processes that Firefox uses to make it even faster.

To change the number of content processes Firefox uses, enter about:config in your address bar, and adjust the number for the dom.ipc.processCount setting (we'll be exposing a visible preference for this in an upcoming release).

Users can test out the claims by downloading Firefox 54 for free from the Mozilla website.

Top Rated Comments

gpat Avatar
57 months ago
Since when is 8GB considered low RAM for browsing?
Score: 18 Votes (Like | Disagree)
Sasparilla Avatar
57 months ago
Nice to see Mozilla is continues to update Firefox. I often use it in combination with Safari (which rules on the Mac) and don't want to see us reduced to a webkit (or webkit forked - Google) mono-culture.

For those interested here is a plug-in compatibility checker for Firefox. If the Firefox installation detects that one of your plugins isn't multi-process compatible it won't enable multi-processing for Firefox on your Mac.

https://addons.mozilla.org/en-US/firefox/addon/add-on-compatibility-reporter/

Adblock and Ghostery were okay for me - but the User Agent Switcher was not, part of Firefox (so I can run more than one instance of Firefox on my OS X desktop with different settings - i.e. different users).

Checking "about:config" in the address bar (say Yes), then go to "dom.ipc.processCount" in the address bar to see how many multiprocess threads you're allocated. Should be 4 if everything is good.

Because of my OSX User Agent Switcher conflict I only have 1 for my processCount. The Windows version of task switcher is compatible, BTW. Mozilla needs to update the OS X version (and probably Linux - they often share alot of code) of the User Agent Switcher to be compatible as well.
Score: 6 Votes (Like | Disagree)
Zirel Avatar
57 months ago
It uses less memory because only a smaller part of the page is rendered.

Safari uses a little bit more of memory, but when you scroll, it's already rendered while on Firefox you have to wait...

Safari is better, also much better performance in JavaScript.

(https://postimg.org/image/6e1t7xf65/)
Score: 6 Votes (Like | Disagree)
fokmik Avatar
57 months ago
firefox is dead, long live safari or chrome or even edge
Score: 4 Votes (Like | Disagree)
batchtaster Avatar
57 months ago
Those are not "Macs", but "Macbooks" on the Apple site.

..... I still feel like you're joking here. A MacBook is not a Mac. Right.....
If that's the case, then Firefox's memory usage on it is a non-issue, since it's not "a Mac" and therefore won't run the "Mac" version of Firefox.

Also, those are iMacs, not Macs. That's how it works, right?

I guess the Mac Pro is also not "a Mac", even though its name suggest it's a Pro version of a Mac.

Please inform Apple, as their website's "Mac" header ('https://www.apple.com/mac/') is apparently wrong.

When I buy "a Mac" in your world, which model do I get?

Attachment Image
Score: 3 Votes (Like | Disagree)
miknos Avatar
57 months ago
So basically ALL Macs since none of them comes with more than 8GB!
Score: 2 Votes (Like | Disagree)

Related Stories

studio buds family

Beats Studio Buds Debuting Today With Active Noise Cancellation, Stemless Design, and More for $150

Monday June 14, 2021 8:00 am PDT by
We've seen a lot of teasers about the Beats Studio Buds over the past month since they first showed up in Apple's beta software updates, and today they're finally official. The Beats Studio Buds are available to order today in red, white, and black ahead of a June 24 ship date, and they're priced at $149.99. The Studio Buds are the first Beats-branded earbuds to truly compete with AirPods...
youtube apple tv

YouTube Discontinuing 3rd-Generation Apple TV App, AirPlay Still Available

Wednesday February 3, 2021 3:09 pm PST by
YouTube is planning to stop supporting its YouTube app on the third-generation Apple TV models, where YouTube has long been available as a channel option. A 9to5Mac reader received a message about the upcoming app discontinuation, which is set to take place in March.Starting early March, the YouTube app will no longer be available on Apple TV (3rd generation). You can still watch YouTube on...
iPhone 13 Dummy Thumbnail 2

Kuo: iPhone 13 to Feature LEO Satellite Communications to Make Calls and Texts Without Cellular Coverage

Sunday August 29, 2021 7:39 am PDT by
The iPhone 13 will feature low earth orbit (LEO) satellite communication connectivity to allow users to make calls and send messages in areas without 4G or 5G coverage, according to the reliable analyst Ming-Chi Kuo. In a note to investors, seen by MacRumors, Kuo explained that the iPhone 13 lineup will feature hardware that is able to connect to LEO satellites. If enabled with the relevant...
YouTube Picture in Picture Feature

YouTube Premium Subscribers Can Now Use iOS Picture-in-Picture: Here's How

Wednesday August 25, 2021 3:55 am PDT by
Google has rolled out picture-in-picture support as an "experimental" feature for YouTube premium subscribers, allowing them to watch video in a small window when the app is closed. If you're a premium YouTube subscriber looking to try out picture-in-picture, follow these steps: Launch a web browser and sign into your YouTube account at YouTube.com. Navigate to www.youtube.com/new. Scroll...
os x mountain lion macs 16x9 2

Apple Makes OS X Lion and Mountain Lion Free to Download

Wednesday June 30, 2021 12:19 pm PDT by
Apple recently dropped the $19.99 fee for OS X Lion and Mountain Lion, making the older Mac updates free to download, reports Macworld. Apple has kept OS X 10.7 Lion and OS X 10.8 Mountain Lion available for customers who have machines limited to the older software, but until recently, Apple was charging $19.99 to get download codes for the updates. As of last week, these updates no...
tim cook spring loaded event

Gurman: Apple Planning Multiple Events for the Fall, M1X MacBook Pros to be Available by November

Sunday August 15, 2021 12:07 pm PDT by
Apple is planning to hold multiple events this fall, which will collectively include the launch of new iPhones, Apple Watches, updated AirPods, revamped iPad mini, and the redesigned MacBook Pros, according to respected Bloomberg journalist Mark Gurman. In his latest weekly Power On newsletter, Gurman says that much like last year, Apple will hold multiple events this coming fall, with the...
apple screen time screen icons

Persistent Kids Finding Loopholes in Apple's Screen Time Limits

Tuesday October 15, 2019 9:44 am PDT by
Apple is currently engaged in a cat-and-mouse game with persistent kids looking to circumvent Screen Time restrictions, but the company has been receiving some criticism for not moving quickly enough to lock down some of the loopholes, reports The Washington Post. A few of the loopholes and ways for parents to shut them down are documented on the site Protect Young Eyes, while these and...
anker lightning cable mfi

Unwrap a New Apple Device? Stock Up on Extra Certified Lightning Cables for as Little as $6

Monday December 25, 2017 5:45 am PST by
If you unwrapped an Apple product today it likely came with one of the company's first-party Lightning cables, but having an extra on hand is always a good idea, so you can place it in other rooms in your house, in your car, or in a bag when you travel. For that reason, now's a good time to shop for third-party Lightning cables that are cheaper than Apple's own accessory, but still Made For...
personal hotspot 1

Apple Acknowledges Personal Hotspot Issues Affecting Some iOS 13 and iPadOS 13 Users

Saturday March 21, 2020 10:04 am PDT by
In an internal document distributed to Apple Authorized Service Providers this week, obtained by MacRumors, Apple has acknowledged that some iOS 13 or iPadOS 13 users may experience issues with Personal Hotspot. Apple has told Authorized Service Providers to expect customers who are unable to connect to a Personal Hotspot or experience frequent disconnection from one. Customers may also...
macos monterey safari beta 3

macOS Monterey Beta 3: Apple Redesigns Safari Tab Interface Following Complaints

Wednesday July 14, 2021 11:39 am PDT by
In the third developer beta of macOS Monterey, which came out this morning, Apple has overhauled the design of Safari, making the tab bar more similar to the current tab bar in macOS Big Sur. The prior Safari design did away with the dedicated URL and search interface, instead allowing any individual tab to be used for navigation input. Tabs were also all arranged at the top of the display...