I just found a way to access my 'lost folder'. Now I click on my original post to reply to it - in case others find it helpful - and I get the message in the Subject box above, 'Topic not found'.
Mozilla Firefox has become a complete mess!
I looked on an old laptop today (running WinXP) just out of curiosity to see what the Mozilla Firefox version was back in the days when Firefox worked well. It was v.52!
