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Firefox Developer Edition. Get the Firefox browser built just for developers. Check out the home for web developer resources. Firefox Reality. Explore the web with the Firefox browser for virtual reality. Donate your voice so the future of the web can hear everyone.

Theming experiment for Firefox Quantum and beyond. 2 days ago  PortableApps.com is proud to announce the release of Mozilla Firefox® Developer Edition, Portable 89b1. It's the developer's edition of the Mozilla Firefox web browser bundled with a PortableApps.com Launcher as a portable app, so you can do web development on the go. Both the 32-bit and 64-bit versions are included. And it's open source and completely free. Firefox Browser, also known as Mozilla Firefox or simply Firefox, is a free and open-source web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation.Firefox uses the Gecko layout engine to render web pages, which implements current and anticipated web standards. In 2017, Firefox began incorporating new technology under the code name Quantum to promote.

Improve your browsing experience by getting your hands on the latest edition of Firefox with the new and improved Quantum engine and all the latest goodies

Firefox Developer Edition, also called Firefox Quantum, allows users to get their hands on the latest features and development tools which will eventually find their way into the mainstream, stable versions of Firefox.

One of the main differences between the latest developer editions and the ones from the past is that they're no longer based on the Aurora channel which has now been scrapped. Instead, the developer version is now based on the Beta channel.

New and improved engine is sure to win back former Firefox users

The star of the show is the new, next-generation engine which now allows Firefox to make the most of all your computer's CPU cores. The effects of those tons of performance improvements are pretty obvious from the first few seconds you start browsing.

Indeed, performance was one of the main goals, but you'll be pleased to hear that various privacy-related improvements have been added as well. For instance, Firefox Quantum is better equipped to block online trackers, as well as at keeping your privacy untouched than the generation it replaces.

Making life better for web developers, one of the top priorities of this new version of Firefox

Furthermore, there's a new set of developer tools available, on top of the ones you're already accustomed to from past versions of Firefox. The main highlights here are the comprehensive JavaScript debugger which is capable of targeting multiple browsers and the support for the CSS Grid which, along with other built-in tools (Style Editor, for example) makes it simple for you to create rich web layouts in the browser.

The Console, Network tabs, and the Inspector have all gained lots of useful new features, as well. For instance, the Inspector is now more suited for CSS work, and the Console supports message grouping and in-line object inspecting.

Refreshed looks thanks to a new user interface called Photon

There are other skin-deep changes as well. For instance, Firefox Quantum introduces a new GUI design-pattern, with a more 'pointy' feel, giving it a more modern look. Gone are the curvy tabs, replaced by clear-cut square tabs, and you can also say goodbye to the boring main menu which has been replaced with a new, better-organized one.

Speaking of tabs, note that Firefox Quantum boasts a new type of new tab window which adds the typical list of most-visited websites and a few recommended stories.

Redesigned engine, more performance, new looks, better developer tools, and an overall better package

All things considered, Firefox Quantum is the biggest leap forward we've seen in the last few years, and it's meant to give Firefox the well-deserved edge over its competition. This is, without a doubt, a very beneficial and a long-awaited overhaul for what is one of the best browsers out there.

Filed under

• New:
• Added content blocking, a collection of Firefox settings that offer users greater control over technology that can track them around the web. In 63, users can opt to block third-party tracking cookies or block all trackers and create exceptions for trusted sites that don’t work correctly with content blocking enabled.
• WebExtensions now run in their own process on Linux
• Firefox now warns about having multiple windows and tabs open when quitting from the main menu. The Save and Quit feature has been removed. You can restore your session by ticking the box for Restore previous session in the General → Startup options or by using Restore Previous Session in the main menu.

Firefox Developer Edition 89.0b3

Firefox Developer Browser Download

runs on:

Windows 10 32/64 bit
Windows 8 32/64 bit
Windows 7 32/64 bit

file size:

52.6 MB

filename:

Firefox Setup 89.0b3.exe

main category:

Internet

developer:

visit homepage

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Firefox Developer Edition integrates all the developer tools you'll need into one package. It is the only browser dedicated to developers.

Click the menu button , then and click to switch between themes.

Download Firefox Developer Browser

For more details, see reverting themes on MDN.

Firefox Developer Edition will create a new profile if you run it at the same time as Firefox. To keep your bookmarks on both versions, see Recover lost bookmarks on Firefox Developer Edition

Firefox Developer Browser Extension

The Mozilla Developer Network is the best place to learn more about Developer Edition. See MDN Developer Edition documentation for more details.