I can not say I had noticed that change.

Not sure about a fix,but there is a very simple workaround:
I often bookmark by clicking on the bookmark star. Doing that does behave as you describe, and remember. It has two sets of arrows,

• the double one at the end of the input field lists recent folders.
• The single down arrow one to the right lists all bookmarks.

John, thank you for the suggestions. That helps to a large extent, although it is still about twice as long to place the bookmark than it took me before. Could I ask then two followup questions: - how can I edit the number of recent folders in the drop down list? - when I click on the star it just goes yellow, doesn't bring up any dialogs - is that how it should be or not?

The recent folders is just that it displays the recent folders used.

The other one may be modified if you have nested subfolders, it will remember the which folders were expanded and which were closed.

Not sure if there are any other work arounds, and I am as yet not sure when the change was made.

You can look at this extension:

• Add Bookmark Here 2: https://addons.mozilla.org/firefox/addon/add-bookmark-here-2/

Thanks, cor-el. That solves it.