If anyone has the expertise to advise how I might transfer plists and other necessary bits within the library in order to effect the desired carryover of profile information, I'd be grateful to receive the information (assuming that I don't have to do anything in Terminal).

EDIT:
After futzing around I was able to set up a Firefox Account, as well as update to Firefox 67.0.4, but I can find no way to carry over my profile preferences anywhere. This is just stupid! So I'm back to my ESR version.

And there is no way of contacting Firefox/Mozilla Support "directly" in order to ask how to do such. Everything shows up as how-to articles which don't cover the requisite solution.

Last edited by grelber; 06/22/19 03:26 PM. Reason: Additional information