Firefox Developer Edition for Mac

Firefox Developer Edition for Mac, 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.

What`s New

• Latest Experimental Web Platform Features – Early access to upcoming APIs and standards.
• Enhanced DevTools Performance Panel – More detailed insights into page speed and rendering.
• Improved CSS Debugging – Advanced Grid, Flexbox, and container query inspection tools.
• Updated JavaScript Debugger – Faster breakpoints and clearer async stack tracing.
• Expanded Network Monitor – Deeper request analysis with improved filtering options.
• Better WebAssembly Support – Enhanced debugging and profiling for WASM apps.
• Refined Responsive Design Mode – More accurate device simulation and viewport testing.
• Improved Accessibility Inspector – Easier auditing of ARIA roles and contrast issues.
• Automatic Profile Separation – Dedicated developer profile with isolated extensions and settings.
• Security and Stability Enhancements – Regular updates with experimental feature toggles for safe testing.

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 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 for macOS 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.

How to Use

Open the DMG file and drag Firefox to Applications

Launch Firefox Developer Edition from Applications

Customize settings via the Developer Tools menu

Start building and testing web apps in the browser

System Requirements

• macOS 10.15 (Catalina) or later
• Intel or Apple Silicon (M1/M2) processor
• 2 GB RAM minimum (4 GB recommended)
• 200 MB of available disk space
• Internet connection for installation and updates

PROS

• Built-in Web Development Tools
• Advanced CSS Grid Inspector
• JavaScript Debugger and Console
• Support for Latest Web Standards
• Separate Profile from Regular Firefox

CONS

• Slightly Slower Than Standard Firefox
• Higher RAM Usage
• Not Ideal for General Browsing
• Limited Extension Support
• Frequent Updates May Break Features

Also Available: Download Firefox Developer Edition for Windows