Firefox, Bookmarks and the drop-down menu when bookmarking

[Basil Chupin]

Am using latest FF (3.6.13) with Maverick - everything up-to-date with 
latest upgrades done some hours ago.

One thing which has been bugging me for a while is that the drop-down 
menu - the menu which allowed you to specify into which folder you 
wanted the bookmarked page to go - has suddenly disappeared and now all 
bookmarked pages are added to the end of list of bookmarks.

I cannot find anything actually covering this development on the Mozilla 
site nor when googling.

Does anyone know why this bookmark hassle has come about and how to 
resolve it?

BC

-- 
"To know that we know what we know, and that we do not know what we do not know, that is true knowledge."
                            Confucius