How to run both versions at the same time on a Mac?

I have a setup of highly personalized FF v42 I'm happy but my Firefox version is seriously outdated and it's time to upgrade. I suspect that a lot of things will no longer work on the latest version (especially some of my old addons).

To facilitate the transition, I want to be able to run my old version (temporarily to say a few weeks) and the latter at the same time in order to customize a new the same standard and find solutions for everything that is no longer supported, and continue to use my old install/addons until this transition is complete.

I found this thread:

https://support.Mozilla.org/en-us/questions/1061740

but the solution has links that no longer work. I couldn't find anything recent on the web or youtube covering the Mac.

I understand that the principles will be to:

1. install the current version to a different location. Is that dragging the .app FF file to somewhere other than the Applications folder or is required as part of the installation?

2. use a different profile for each installation. Not sure what order to do so that I do not lose my current profile (old). I guess it's to create a new profile, switch to the new profile and then install the current version, which "takes over" the new profile. Then I can go back to the former when I run my my old FF?

Any help much appreciated.

Installation of multiple versions on Mac OS X is basically dragging the Firefox application out of the DMG file to the desktop and rename the folder. You can drag the Firefox application folder renamed in the Applications folder as normally install you Firefox.

You will need to use the Terminal to create a new profile for this version. Make sure that no profile is selected by default for Profile Manager to display when you start Firefox. You can check that in the profiles.ini file.

Tags: Firefox

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