Firefox Quantum is now available in Developer Edition, and this Firefox is fast.

Firefox Developer Edition will therefore make it possible to obtain the most recent features more quickly without risking the instability of a Nightly: Firefox Developer Edition can be used without problems on a daily basis and it's pretty cool. In short, Firefox Developer Edition is a nice surprise for developers. Firefox ब्राउज़र Developer Edition आपके नये पसंदीदा ब्राउज़र में स्वागत हैं. नये सुविधायें, तेज प्रदर्शन, और डेवलपमेंट उपकरण जो आपके खुले वेब को. Jan 05, 2018 That distinction has moved to Chrome. And with Firefox Developer Edition, Mozilla ain’t having none of it. In case it wasn’t clear from the name, Mozilla is specifically targeting web developers and designers with Firefox Developer Edition. One of the big draws to Chrome are the fantastic dev tools that come with it through the inspector. Firefox Developer Edition will therefore make it possible to obtain the most recent features more quickly without risking the instability of a Nightly: Firefox Developer Edition can be used without problems on a daily basis and it's pretty cool. In short, Firefox Developer Edition is a nice surprise for developers.

As a reader of the Hacks blog, you may be familiar with Project Quantum, our attempt to refactor, redesign, replace, and modernize the very core of Firefox. We’ve shipped many incremental improvements to Firefox in the past, but this release marks the first milestone where we believe Firefox fundamentally feels like a newer, better browser.

To celebrate, we gave Developer Edition a brand new logo:

Firefox Developer Edition

Why does this feel like a brand new browser? Read on!

Firefox Quantum: Towards a next-gen browser

Developer Edition now includes “Quantum CSS,” an entirely new CSS engine written in Rust and based on the Servo parallel browser engine project. Additionally, the “Quantum Flow” team tracked down and fixed 369 performance bugs in Firefox, with a special focus on responsiveness and UI interactions. Lastly, the “Quantum DOM” project began overhauling how Firefox prioritizes work, responding more quickly to events like user input while delaying less urgent computations until the browser is idle.

The result? Compared to Firefox six months ago, today’s Developer Edition is twice as fast on benchmarks like Speedometer 2.0 that simulate the real-world performance of modern web applications.

Furthermore, Firefox is 64-bit and multi-process by default, and Firefox’s unique architecture allows it to take advantage of modern, multi-core processors while still respecting your available RAM. Meanwhile, the “Quantum Compositor” project significantly reduced crashes caused by buggy graphics drivers.

Photon: Firefox’s new UI

To complement Quantum, the Photon team rebuilt Firefox’s interface to be faster and more modern:

You’ll hear more about Photon in November, but highlights include redesigned menus, square tabs, and a new “Library” button that acts as a single place for your bookmarks, downloads, history, etc. By default, Photon combines the search and URL bars into a single widget, but the old style is only a preference away.

The “Activity Stream” project redesigned the New Tab Page to feature highlights from your recent history and bookmarks, as well as recommendations from Pocket. Of course, each of these content blocks are optional, and add-ons can completely replace the new tab page to create entirely different experiences.

We also refreshed form handling in Firefox, adding a brand new autofill feature and implementing built-in widgets for <input type=date> and <input type=time> elements.

Lastly, Firefox’s preferences were completely redesigned and are now searchable.

DevTools in 57: Redesigned and better than ever

Firefox Quantum: Developer Edition also includes a ton of refined, redesigned, and brand new developer tools.

A few highlights:

• The Console, Debugger, and Network tabs are now implemented using standard web technologies, including React and Redux, as part of our “devtools.html” effort.
• The Inspector gained tons of new features for working with CSS Grid, CSS Variables, toggling classes on elements, etc.
• The Console now supports grouping messages and expanding / inspecting objects in-line.
• The Debugger offers completely new ways to search, navigate, and debug projects.

And that’s not all. To read in greater depth about what’s new in Firefox Developer Tools, check out Developer Edition Devtools Update.

Project Quantum: There’s more to come

Firefox Developer Edition Linux

Today’s release isa major milestone in Project Quantum, but we’re not done. Future releases of Firefox will include Quantum Render, a brand new, GPU-optimized rendering pipeline based on Servo’s WebRender project, and Quantum DOM Scheduler, a new technique that ensures that tabs in the background can’t slow down your active tabs.

Try out Developer Edition today, or sign up to get notified when Firefox Quantum is released to mainline Firefox. Either way, stay tuned to the Hacks blog to learn more about Project Quantum!

About Dan Callahan

Engineer with Mozilla Developer Relations, former Mozilla Persona developer.

About Firefox Developer Edition

Formerly known as Firefox Quantum, Firefox Developer Edition 89.0b1 is a specialized web browser built especially for web developers. Some of these tools and features eventually do make their way into the main Mozilla Firefox web browser. Stepping aside from the main development branch of Firefox, Firefox Developer offers a number of features that are currently not present in Firefox, namely beta features and tools for web development. This download is licensed as freeware for the Windows (32-bit and 64-bit) operating system/platform without restrictions. Firefox Developer Edition is available to all software users as a free download for Windows.

We tested the file Firefox Setup 89.0b1.exe with 24 antivirus programs and it turned out 100% clean. It's good practice to test any downloads from the Internet with trustworthy antivirus software.

Older versions of Windows often have trouble running modern software and thus Firefox Developer Edition may run into errors if you're running something like Windows XP. Conversely, much older software that hasn't been updated in years may run into errors while running on newer operating systems like Windows 10. You can always try running older programs in compatibility mode.

Officially supported operating systems include 32-bit and 64-bit versions of Windows 10, Windows 8 and Windows 7.

The current version of Firefox Developer Edition is 89.0b1 and is the latest version since we last checked. This is the full offline installer setup file for PC. This site has hosted other versions of it in the past such as 88.0b9, 88.0b7, 88.0b5, 88.0b2 and 87.0b9. At the moment, only the latest version is available.

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