Well, I posted an article a few weeks ago explaining how you can install multiple versions of IE at the same time.

Now, I found the need to have multiple versions of Firefox running on my PC, so I started Googling again.

I came across two good articles dealing with the subject. The first article I came across dealt specifically with installing multiple versions on a Mac. The next article, however, dealt with doing the same thing on a Windows computer.


Basically, all you need to do is follow these simple steps:

  1. Close all instances of Firefox
  2. Open the Firefox Profile Manager. To do this, you will need to open Firefox from the command-line, and add the “-Profilemanager” switch to it. So, the command might look something like “”C:\Program Files\Mozilla Firefox\Firefox.exe” -Profilemanager”
  3. Create a new profile, and give it a name that indicates which version of Firefox you will be using that profile with. For instance, if you are getting ready to install Firefox 1.5.2, name your new profile “Firefox-1.5.2″. (You can not use spaces in the names of your profiles).
  4. Download a copy of the Firefox version you want to install
    Note: If you have trouble finding older versions of Firefox for download, you can find them at FileHippo or OldVersion.
  5. Install the new copy, but make sure that you choose a “Custom” install. Then, when you get to the point where you select which directory to install Firefox to, you want to choose a unique directory. I recommend naming the directory the same as the profile you created.
  6. Once the install is completed, create a shortcut to the version of Firefox you just installed. Then, edit the “Properties” of that shortcut and add the following to the “Target”: “ -P “Firefox-1.5″”. Be certain that you place that outside of the closing quotation mark that comes after “.exe” in the current target. Also, replace “Firefox-1.5″ with the actual name of the profile you want to use for that version of Firefox.

Once you do all that, you should have no trouble running multiple versions of Firefox. However, it is important to know that you cannot run two different versions at the same time. You will need to close your Firefox browser before attempting to open a different version of Firefox. If you are feeling extremely adventurous, and you are indeed using a Windows box, you can follow the method outlined on HiveMinds Web site.

Also, if you find that you need new Firefox icons in order to distinguish between the different versions, you should be able to find a lot of good ones by simply using Google. However, I have saved you a little bit of trouble by searching for you. Here are a few good places to find some nice icons:

Tech Tags: HTMLCenter multiple+version

Related posts:

  1. IETester – Test Your Web Apps on Multiple Versions of IE
  2. Firefox 2.0 Tips
  3. Firefox and HTML5