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Latest Version Firefox Developer Edition 121.0b6 (64-bit)

Windows 7 64/Windows 8 64/Windows 10 64/Windows 11

Updated December 03, 2023
Author Mozilla Organization
Category Browsers and Plugins
License Open Source
Language English
Download 768


Firefox Developer Edition, which is better known as Firefox Quantum, lets you try out the newest development tools and features that are coming to the main Firefox versions soon.

What makes the newest developer editions different from the previous versions is they don’t use the Aurora channel as their basis anymore. Now they use the Beta channel as their basis.

Enhanced Engine to Attract Previous Firefox Users

The next-generation web browser engine lets Firefox utilize virtually all the CPU cores of your computer. You’ll notice a faster performance within seconds after you begin browsing with it.

The primary goal for this engine was a better performance, but there were improvements made to its privacy features too. For example, Quantum can block trackers on the internet and prevent your privacy from being compromised.
The Latest Firefox Helps Web Developers

You’ll find a lot of awesome new developer tools in this latest Firefox version. The previous tools are also in there. Some of the most notable tools include the JavaScript debugger that targets several different browsers and the CSS Grid that lets you create dynamic and elaborate web layouts.

There are several new features for the Inspector, Console and Network tabs. For example, CSS work can now be done with the Inspector. As for the Console, it now lets you inspect in-line objects and conduct group messaging.

The new “Photon” user interface comes with a refreshed appearance

The GUI design pattern of the interface is brand new and feels more modernized. The square tabs have replaced the curvy tabs. Plus, there is a new main menu that is better organized than the old menu.

The tab window of Firefox Developer Edition 64 bit is new and includes a list of recommended stories and most-visited websites.

A totally redesigned engine which looks new and performs better

Within the last couple of years, Quantum is a huge innovation for Firefox and certainly outperforms the competition. This will certainly help bring back the Firefox browser into the mainstream.

Previous versions More »

121.0b6 December 03, 2023 58 MB 121.0b5 November 30, 2023 58 MB 121.0b4 November 29, 2023 58 MB 121.0b3 November 26, 2023 57.9 MB 121.0b2 November 24, 2023 57.9 MB 121.0b1 November 22, 2023 57.9 MB