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Firefox Developer Edition 154.0b2 (64-bit) icon

Firefox Developer Edition 154.0b2 (64-bit)

154.0b2
Mozilla Organization
5.0
88.2 MB size

Get the latest features, fast performance, and the development tools!

Firefox Developer Edition is a specialized version of the Mozilla Firefox browser designed specifically for web developers.

It provides advanced development tools, experimental web technologies, and enhanced debugging features to help developers build, test, and optimize modern websites and web applications.

Firefox Developer Edition includes powerful browser development tools such as CSS debugging, JavaScript debugging, responsive design testing, and network monitoring. It allows developers to explore upcoming web standards before they become available in the standard Firefox browser.

Features of Firefox Developer Edition

Advanced Developer Tools

Firefox Developer Edition includes a complete set of built-in developer tools for analyzing and improving websites.

Developers can inspect page elements, debug code, monitor network activity, and analyze browser performance directly from the browser.

CSS and JavaScript Debugging

The integrated debugger provides powerful tools for working with modern web technologies.

Developers can:

  • Debug JavaScript code
  • Inspect CSS layouts
  • Analyze page behavior
  • Identify performance issues

Responsive Design Mode

Firefox Developer Edition includes responsive design testing tools that allow developers to preview websites on different screen sizes and devices.

This helps ensure websites provide a consistent experience across desktops, tablets, and mobile devices.

Network Monitoring

The Network Monitor provides detailed information about website requests, loading performance, and resource usage.

Developers can analyze network activity and optimize website speed.

JavaScript Performance Profiling

The built-in JavaScript profiler helps identify slow scripts and performance bottlenecks.

Developers can optimize web applications by analyzing script execution and browser performance.

WebSocket and Service Worker Debugging

Firefox Developer Edition provides tools for inspecting modern web technologies, including WebSocket connections and service workers.

These features help developers build advanced web applications with real-time communication and offline capabilities.

Multi-Account Containers

The browser includes Multi-Account Containers, allowing developers to separate different browsing sessions within the same window.

This is useful for testing multiple accounts, environments, and user scenarios.

Experimental Web Technologies

Firefox Developer Edition provides early access to new web platform features and experimental APIs.

Developers can test upcoming technologies and prepare websites for future browser standards.

Developer-Focused Customization

The browser offers developer-oriented settings, themes, and preferences designed to improve productivity.

It can run alongside the standard Firefox browser with separate profiles and configurations.

Open-Source and Privacy Focused

Based on the Mozilla Firefox platform, Firefox Developer Edition benefits from open-source development and strong privacy protection features.

It provides developers with a powerful alternative environment for modern web development and testing.

Information about Firefox Developer Edition 154.0b2 (64-bit)

License Open Source
Op. System Windows
Category Internet
Language English + more
Author Mozilla Organization
permission icon Permissions Not applicable
Date 2026-07-26
Size 88.2 MB
File type Official Website

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