multifirefox ☆

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Description:
Launcher utility to run multiple versions of Firefox side-by-side

Type: Cask | Latest Version: 2.3.3@0 | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: firefox browser testing developer-tools version-manager

Install: brew install --cask multifirefox

About:
MultiFirefox is a macOS launcher utility that enables users to manage and execute multiple distinct versions of the Firefox web browser simultaneously. It works by dynamically modifying the Firefox application bundle identifiers, allowing different versions to run side-by-side without conflicts. This tool is essential for developers and testers who need to verify web application compatibility across various Firefox releases.

Key Features:

Run multiple Firefox versions concurrently
Automatic bundle identifier management
Simple drag-and-drop version installation
Intuitive menu bar interface for version switching

Use Cases:

Web developers testing site compatibility across different Firefox versions
Quality assurance engineers verifying browser-specific bug fixes
Users needing to maintain legacy Firefox builds for specific web apps

Alternatives:

Firefox Developer Edition – Provides a single beta channel build; MultiFirefox allows running stable, beta, and ESR versions simultaneously for broader testing.

Version History

Detected	Version	Rev	Change	Commit
Aug 5, 2025 2:21pm	2.3.3	0	VERSION_BUMP	2fe95de0
Jul 27, 2024 1:48pm	2.3.3	0	VERSION_BUMP	81af43d8