Free Download Mozilla Firefox Developer Edition, the latest standalone offline installer for macOS. It provides the latest features, fast performance, and the development tools you need to build for the open web.

Overview of Firefox Developer Edition for macOS

It is a dedicated browser designed to empower web developers with powerful tools and features. Tailored for seamless integration into the development workflow, it offers capabilities such as Responsive Design Mode, built-in WebIDE, JavaScript Debugger, and various other tools to optimize the development process. With a commitment to accessibility, security, and cross-browser development, it provides a comprehensive environment for developers to easily create, debug, and refine their web applications.

Features of Firefox Developer Edition for macOS

  • Responsive Design Mode: Allows developers to test and optimize their websites directly across various devices and screen sizes within the browser.
  • Built-in WebIDE: With a built-in WebIDE, developers can create, edit, and debug web applications directly from the browser. This integrated development environment simplifies the coding process and enhances productivity.
  • JavaScript Debugger: Developers can efficiently identify and fix errors in their code, ensuring a smoother development experience.
  • Network Monitor: Developers can inspect and monitor network requests, helping to optimize page load times and improve overall performance.
  • Page Inspector: Includes a powerful Page Inspector tool that enables developers to inspect and modify the HTML and CSS of a page in real time. This aids in fine-tuning the visual elements of a website.
  • WebAssembly Tooling: Provides dedicated tools for debugging and profiling WebAssembly code, ensuring a seamless integration of this emerging technology.
  • Accessibility Inspector: Developers can assess and enhance the accessibility of their websites for a broader audience.
  • Valence for Cross-Browser Development: Facilitates cross-browser development by allowing developers to connect to other browsers like Chrome and Safari, enabling simultaneous testing across different platforms.
  • CSS Grid Highlighter: Designing responsive layouts is simplified with the CSS Grid Highlighter, which visually overlays a grid on a webpage, making it easier for developers to create and optimize grid-based designs.
  • Security Panel: Provides insights into the security features of a website. Developers can identify potential security issues and ensure the safety of their web applications.

Technical Details and System Requirements

MacOS 10.12 or later


Q: Can I use it alongside the regular Firefox browser?

A: Yes, you can use both browsers simultaneously. They operate independently and do not interfere with each other.

Q: Are the developer tools exclusive to Developer Edition?

A: While some tools are available in the regular Firefox browser, the Developer Edition offers a comprehensive set of developer-focused features and tools.

Q: Can I customize the appearance?

A: Yes, it allows for extensive customization, from themes to tool placement, providing a personalized development environment.


It is a powerhouse for web developers, offering various tools and features tailored to streamline development. Whether debugging JavaScript, optimizing web performance, or ensuring accessibility, it provides the tools you need in a seamless and integrated environment. Stay ahead in the world of web development, where innovation meets efficiency.

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