Hi Tony, are you done using Firefox ESR? If you wanted to use both simultaneously, you could use Firefox Sync. But if you're done with ESR:

The two versions are using different profile folders. You can have Firefox 124 take over your Firefox ESR profile folder and upgrade it to the latest formats. After that, Firefox ESR will not want to use and will insist you create a new profile. At that point, you can remove Firefox ESR, but if Firefox asks about removing data tell it not to remove any data. Sound good? Here's how:

(1) Quit Firefox ESR

(2) Start Firefox 124 and open the About Profiles page by typing or pasting about:profiles in the address bar and pressing Return to load it.

This page should list at least two profiles, and could list more. (Each profile has two folders and one or more buttons. Do not use any Remove buttons!)

(3) The profile that Firefox 124 is currently using will have this:

This is the profile in use and it cannot be deleted.

(4) For each of the other profile(s) listed on this page:

Check whether this is your migrated profile by clicking its Launch profile in new browser button.

If that isn't the one you want, simply close that new window.

If it IS what you want, back on the about:profiles page, click the Set as default profile button for that profile so Firefox uses it automatically at the next startup.

(5) After that, you can quit/restart Firefox and it should come up using the migrated profile.

Success?

Hi jscher2000,

It solved the problem beautifully.

(The only problem I had was that I asked the question from 124, d'oh!, so when I re-opened it, it'd forgotten where I'd found you. The hardest bit was getting back here to say thanks).

Thank you so much.

Tony