Lately, during our development process, we came across a situation wherein we had to test our application designs on Mozilla Firefox 1.5 and 2.0. This was causing a lot of problems as we had to keep checking on multiple machines, because each machine had only one version either 1.5 or 2.0.

I read many posts on how to install multiple versions of Firefox. But there as a catch, I could run only one instance at a time. That means, if I open a window for Firefox 1.5, I can’t open another window with Firefox 2.0

Below are the steps I followed with inputs from Hiveminds

1. Download both the versions of Mozila Firefox (1.5/2.0) into a seperate directory
2. Install both the versions into a seperate directory using the “Custom” option. For e.g. for 1.5, I used
   C:\Program Files\Mozilla\Firefox1.5.x
   and for 2.0, I used
   C:\Program Files\Mozilla\Firefox2.0.x
3. After installing, open the profile manager. Go to Start > Run and paste the below code
   "C:\Program Files\Mozilla\Firefox2.0.x" -ProfileManager
4. Create two new profiles viz – “Firefox1.5.x” and “Firefox2.0.x”. Doesn’t matter which directory it saves in
5. Fire up your notepad and paste the following code for FF2.0
   @echo off
set MOZ_NO_REMOTE=1
start "" "C:\Program Files\Mozilla\Firefox2.0.x\firefox.exe" -P "Firefox2.0.x"
set MOZ_NO_REMOTE=0save it as "FF2.0.x.bat"

   paste the below code for FF1.5@echo off
set MOZ_NO_REMOTE=1
start "" "C:\Program Files\Mozilla\Firefox1.5.x\firefox.exe" -P "Firefox1.5.x"
set MOZ_NO_REMOTE=0

   save it as “FF1.5.x.bat“

6. Save both the files on your desktop and you are done! Execute both files one by one and see the magic unfold

This entry was posted on Friday, May 18th, 2007 at 6:40 pm and is filed under Development. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.