Well, why would you want to do this? Basically, you can use Firefox instances that are of different versions or maybe even with different profiles.
Running multiple Firefox instances at the same time
March 27, 2010 at 2:01 pm (Browsers, Useful information)
Tags: batch, firefox, instance, multiple, script
How to hide/show Messenger Plus! ‘contacts on desktop’ based on a hotkey
January 11, 2010 at 3:36 pm (Useful information, Windows)
Tags: autoit, automated, contacts, desktop, floating, hide, hotkey, messenger, plus, script, shortcut, show
Earlier today, I’ve made another post doing something very similar to this one. You can have a look at it here.
We are going to do the exact same thing actually, but this time, you will be able to use the code that I’m giving without any modification.