Written on July 20, 2009 at 5:22 pm

Whew… Long title.

So I do some web development and there are instances where I need to test on multiple browsers (and multiple versions of browsers). It was pretty easy to install multiple instances of Firefox on my Mac (running OS X Leopard):

  1. Go to Mozilla and download the dmg.
  2. Mount the dmg file
  3. Instead of dragging and dropping the version into your applications from the mounted image, go to your applications folder and create a new folder for the version you want. firefox-fun
  4. Drag the application into your newly created folder
  5. Drag the app from your folder into the dock (or run the app and choose to keep in dock).

Voila. You’ll be able to test sites on different versions of Firefox.  Have fun.

firefox-on-my-dock

UPDATE: One more step I forgot about to make your life easier. Go here and learn how to create a profile for each of your accounts (like I did below) and then you won’t be prompted for updates each time you open that version of Firefox. I just saved mine into the version folder for each version.

firefox-profile-manager

5 Comments so far
  1. Polprav says:

    Hello from Russia!
    Can I quote a post in your blog with the link to you?

  2. I’m not that much of a online reader to be honest but your sites really nice, keep it
    up! I’ll go ahead and bookmark your site to come back later. All the best

  3. Fodor Kovski says:

    When I installed the second copy of FF in my machine this caused my dog to fart loudly on the kitchen floor. I think you should improve the instructions for doing this to take into account pet owners.

  4. Martin says:

    Title is wrong and misleading. These are not instances, just different versions. Every child can do this.

    • admin says:

      Martin, sorry, I guess I’m a child, because this solved my original problem and I wrote a blog post about it a few years ago. So what’s the difference between an instance and a version in this case? They are unique binary versions that I can test with.

5 Responses to “How to run multiple Firefox instances on Mac OSX Leopard”




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