MultiFirefox for Mac

Used MultiFirefox for Mac?

MultiFirefox Analysis

AI Assisted Content · June 11, 2026

Not written by CNET Staff.

MultiFirefox is a free web browser application designed for Mac users, allowing multiple instances of Firefox to run simultaneously. This unique functionality is particularly beneficial for users who need to manage different profiles or sessions without switching back and forth between them. The application maintains the distinct user profiles, ensuring that bookmarks, history, and settings remain separate for each instance, which enhances productivity and organization.

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In addition to its profile management capabilities, MultiFirefox offers an intuitive interface that simplifies navigating between different Firefox windows. Users can easily launch multiple instances with just a few clicks, making it an ideal solution for developers, testers, or anyone who requires a streamlined browsing experience. Overall, MultiFirefox stands out as a practical tool for those looking to optimize their web browsing tasks on a Mac.

MultiFirefox for Mac

Used MultiFirefox for Mac?

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Full Specifications

GENERAL

Release: December 12, 2008

Latest update: June 11, 2026

Version: 2.1.001

OPERATING SYSTEMS

Platform: Mac

Operating System

Mac OS X
Mac OS X 10.5
Mac OS X 10.4
Mac OS X 10.3.9

Additional Requirements: None

POPULARITY

Total Downloads: 3,357

Downloads Last Week: 0

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Last Updated

User Reviews

2.7/5

3 User Votes

I'm running 3.5r1 at the moment, so . . .
SandFarmerJune 17, 2009
Pros
None for me.
Cons
Won't switch 3.x to 3.x.
Summary
Not something I can use, but there may others that can use it.
MultiFirefox has been updated
themartoranaMay 8, 2008
Pros
@pmishler - MultiFirefox has been rewritten in Objective-C and Cocoa, which alleviates some of the issues that people were having with Python. Further, it's now 10.4 (Tiger) compatible, and is at version 2.0, not 1.2 that is listed above.<p>Finally, it does expect that both MultiFirefox and Firefox 3.5 (or whatever versions you have - and you can have as many as you like) all live in your /Applications folder.<p>CNet is a little slow at updating submitted content, so to get the newest version, go to codecontortionist.com and click on the MultiFirefox link in the left column.
Cons
Summary
Doesn't work for me
pmishlerApril 8, 2008
Pros
I like the idea, if it worked
Cons
I put the dmg file in the same directory as FF3.5 as directed, and each time I click on the FF icon I get only FF 2, with no indication how to switch.
Summary

Developer’s Description

By Dave Martorana

Run multiple versions of Firefox side-by-side without conflict.

MultiFirefox is a launcher app that runs multiple versions of Firefox at the same time. Run Firefox 2, 3, Minefield, and any others, all at the same time, side-by-side. Helps you create unique profiles for each version, remembers your last selections, etc.