Look on your desktop. Do you see a folder called; Old Firefox? Look inside. Look for the folder with the latest creation date.

https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile

https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder

https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

Type about:profiles<enter> in the address bar. How many profiles are listed? How many should be there? Also, open the profile folder in your file explorer.

Hey, Fred.

I knew I had to look at my profiles, but WHY DID THIS HAPPEN?

The one on my DT is too old. I have 3 profiles + default-release. The 2 - Feb 2020 and April 2019 are good. Today's default is WUT? Default-release is WUT?

Sorry to be nitpicky - but which of the links of the 7 above should I open? Impatient here...

Thank you.

Interesting and annoying.

February 2020 has my missing addons, so I assume that is what I need. I set it as default, and have both browsers open. The only way to open it to keep both versions open. In other words, I set it as default and it shows it IS defaulted, but it is NOT defaulting.

Followed instructions using https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile

After selecting the data that you want, you should Copy that data to the current profile.

I knew I shouldn't have had to copy. Now it is defaulting.

Thank you.