Firefox Developer Edition

126.0b3 Web development browser for Windows

Sven Sorensen

Browser for web developers with tools to facilitate testing, debugging and optimizing websites and applications.

Free and open source Internet browsing software download, reviewed by Sven Sørensen
New and improved engine is sure to win back former Firefox users - Screenshot of Firefox Developer Edition
Making life better for web developers, one of the top priorities of this new version of Firefox - Screenshot of Firefox Developer Edition
Refreshed looks thanks to a new user interface called Photon - Screenshot of Firefox Developer Edition
Redesigned engine, more performance, new looks, better developer tools, and an overall better package - Screenshot of Firefox Developer Edition
Test new features and detect bugs with ease - Screenshot of Firefox Developer Edition
Get the latest features, fast performance, and the development tools - Screenshot of Firefox Developer Edition
Firefox Quantum - Screenshot of Firefox Developer Edition
Firefox - Screenshot of Firefox Developer Edition
User interface - Screenshot of Firefox Developer Edition
Firefox Developer Edition screenshot
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An enhanced version of Firefox browser aimed at developers with tools, improved backend and debugging for HTML, JavaScript and CSS with a built-in style editor.

Formerly known as Firefox Quantum, Firefox Developer Edition 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.

The look and feel of Firefox Developer Edition is slightly different from the main release, but it's nothing to get too excited about; it's mainly just the color scheme.

In terms of tools, Developer Edition provides a WebIDE, Browser Console, Responsive Design Mode, Eyedropper, Scratchpad (for JavaScript debugging) and Service Workers. These tools can be handle for testing web applications.

Like the main branch of Firefox, this version also includes the main development tools like the Inspector, Console, Debugger, Style Editor, Performance tab, Memory, Network, Storage and Accessibility.

Features of Firefox Developer Edition

  • Accessibility Inspector: Evaluate web pages for accessibility issues.
  • CSS Grid Layout: Create powerful and adaptive layouts with the enhanced Grid Inspector.
  • DOM Inspector: Examine web page structure and layout.
  • Developer Toolbar: Quickly access Firefox Developer Tools.
  • JavaScript Debugger: Debug JavaScript code line-by-line.
  • Memory Tool: Track and analyze memory usage in web pages.
  • Network Monitor: Monitor web requests and responses to detect performance issues.
  • Performance Tools: Analyze and optimize the performance of web content.
  • Responsive Design: Quickly build, test and preview responsive websites.
  • Scratchpad: Test JavaScript code in an interactive environment.
  • Source Editor: Edit and debug HTML, CSS and JavaScript.
  • Style Editor: Create and edit CSS rules.
  • Validation: Validate HTML, CSS and other web technologies.
  • Web Console: View and debug messages logged by the browser.
  • WebIDE: Develop, deploy and debug Firefox OS apps.

Compatibility and License

Firefox Developer Edition is free software made available under the Mozilla Public Licence for the Windows operating system from web browsers. With this type of license, users are permitted to freely download, modify and distribute it without any real restrictions.

Mozilla accepts donations for the continued development of this free software.

What version of Windows can Firefox Developer Edition run on?

Firefox Developer Edition can be used on a computer running Windows 11 or Windows 10. Previous versions of the OS shouldn't be a problem with Windows 8 and Windows 7 having been tested. It comes in both 32-bit and 64-bit downloads.

Filed under:
  1. Firefox Developer Edition Download
  2. Free Web Browsers
  3. Open source and GPL software
  4. Internet Browsing Software
Firefox Developer Edition has been picked by our editors as good software.
We have tested Firefox Developer Edition 126.0b3 against malware with several different programs. Please review the test results. We have not certified this program as clean. [Read more]