Sue, this is probably the easiest first method to try, to set the newly installed standard Firefox to use the data from the original ESR profile: https://support.mozilla.org/en-US/kb/recover-user-data-missing-after-firefox-update

TechHorse, I followed the Link for Recover user data and I think that Firefox2 (the 131 version) picked up the old profile. The instructions didn't tell me that I have to close Firefox2 before the changes are applied and initially I thought that the Firefox2 didn't pick-up the old profile.

After I closed Firefox2, I am seeing my bookmarks, the exceptions for cookie deletions, the add-ons and the tabs I had opened in Firefox opened in Firefox2.

I wanted to open Firefox (ESR) and I got a warning to not do it as it is an older version and could mess up the bookmarks, so I didn't do it. With your very generous help and patience it seems that it might have happened.

Is there anything else I should check or the above is conclusive? I am not sure what to do next. Would it be enough to just remove the icon for Firefox ESR from the dock? I would be afraid to de-install because the Library/Application Support shows the two Firefox folders and Firefox 2 shows zero bytes, something that I do not understand. I attached a screen capture for that.

I really appreciate that you didn't give up on me. I am afraid to believe that it might be done.

I wanted to come back to thank you one more time, TechHorse. The up-to-date (non ESR) version is now my default and I am ignoring whatever might be there for the ESR. I do not need more problems than what I had, as I saw that nobody else but you provided useful help when in trouble. Using a product like Firefox which is complex from a technical perspective with zero support from those who offer it is a risky proposition.

I hope that it will keep working.

Sue, no problem, and glad that you were able to get things working to a satisfactory level.