How can I install different varsions of Firefox

I would like to install 2 different versions of Firefox on my Windows 7, one of them an older version. I have absolutely no idea how I can do this. Please help.

Hi Melita,

Here you go:

Installing and running multiple versions of Firefox

Thank you for this link. If I can find some help with step by step instructions I will have more confidence in doing this. Similar to how they go about it in 'Windows for Dummies'

I understand completely! I have a client server issue to attend to shortly & I can't remote fix it unfortunately. I will, most probably, be gone for several hours. It's 6pm here in SE Michigan!
I believe Alberta is a 3 hour time difference, that would be 3pm your time, if I'm correct.

You may have another SevenForums Member respond to your request before I make it back home.

Actually I am now in Ottawa and there doesn't appear to be any time difference from Michigan. Awaiting reply from you or some one else.

Thank you

Well, life got in the way this weekend, now all is well!

I didn't forget you! I would recommend that you run additional versions of Firefox as portable apps. There is no actual installer is utilized as with normal Firefox install. Here's the link to the website.
Mozilla Firefox, Portable Editions
Note: Read the entire page. There are multiple versions available including multiple languages.

For launching Firefox Portable as multiple simultaneous instances, you would need to edit the FirefoxPortable.ini file and change the AllowMultipleInstances=false preference to true.
Can you do this change without assistance? All it requires if for you to find the ini file, open it by double clicking and change false to true then close the file.

Here's a link to portableapps.com platform
PortableApps.com Platform - Free App Store & Menu

Here's a video for you to peruse. The Platform provides a means to update your portable Firefox to newer version and security updates (important and necessary for security purposes).
Portable Apps (03) PortableApps.com Platform - YouTube

You don't have to install it to USB or the Cloud, install it in your programs folder. If the app is x32 (32 bit) it should be installed in the Programs(86) folder, x64 (64bit) in the Programs folder. Firefox is in folder Mozilla Firefox

Your system most likely will not be displaying file extensions (the .exe), so scroll down the list until you find firefox, then look under the type column, you're looking for application, that is firefox.exe.

You can create a shortcut on your desktop. This is accomplished by right-clicking firefox.exe. In the popup menu hover cursor on send to, choose Desktop (create shortcut)

If you have any problems, additional questions, etc. we're here for you.

Thank you very much. This I can easily do but I need a little more help. I am trying to find a list of Firefox versions available at:

Mozilla Firefox, Portable Editions

Found the Catogary View>Browsers but unable to find the list to choose from. Only one version is shown when I click on "Mozilla Firefox, Portable Edition" and that is 60.0.3

From the linked page
Also Available: Firefox ESR (Extended Support Release), Firefox Developer Edition, Firefox Beta, Firefox Nightly, Legacy versions
--> Firefox Extended Support Release (ESR) is based on an official release of Firefox for desktop for use by organizations who need extended support for mass deployments.

Developer Edition is an unstable testing and development platform.
Nightly is an unstable testing and development platform.
Legacy versions are older versions of Firefox.

Thank you very much for great help. I can manage now.