Future Firefox versions will come with new features for handling bookmarks.

One of them it to allow setting a default folder for saving a new bookmark (toolbar|menu|unfiled).

• browser.bookmarks.defaultLocation = [toolbar|menu|unfiled|guid]

There will be more options for showing the Bookmarks Toolbar in Firefox 85 (checkbox for showing the BT will become a sub menu: newtab|always|never).

• browser.toolbars.bookmarks.visibility = [newtab|always|never]

These new features are still under development and are currently behind a Boolean pref named browser.toolbars.bookmarks.2h2020 that is false for now, enabling these new features is at your own risk.

• Bug 1665353 - [meta] 2020H2 bookmarks improvements

(please do not comment in bug reports
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html)

Thank you, I think. I enjoy using technology. I enjoy troubleshooting issues and attempting to resolve on my own when feasible. Your answer tells me to wait for V. 85 and I will be able to do what I want. However, your references to various files / locations / BT / et al are too technical for me and I would not know where to start, nor how to proceed. I will simply wait for V. 85

You can open the about:config page via the location/address bar. You can click the button to "Accept the Risk and Continue".

• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

Dear cor-el - Your answer / comments above state "Future versions ...new features ... one of them to allow setting a default folder for saving a new bookmark. In the last few days I have received and updated Firefox to V.85 I have looked for the feature allowing me to set a default folder for saving new bookmarks. I have read the Support pages in Help for using Bookmarks. However, I have not seen anywhere in V.85 or in the commentary that points me to setting a bookmarks default folder. Was this new feature not turned on in V.85? If it was turned on, where do I find it and how do I use it? Thank you.

Firefox 85 saves the last used folder in a preference named

browser.bookmarks.defaultLocation

and then uses that for the next save, and so on.

What you see in about:config is a unique key value not the actual folder name, so don't be surprised if it's completely unreadable.

The only way to get a fixed default folder in 85+ would be to use an autoconfig.cfg file to lock browser.bookmarks.defaultLocation to the folder you want to use.

• https://support.mozilla.org/en-US/kb/customizing-firefox-using-autoconfig

//
lockPref("browser.bookmarks.defaultLocation", "unfiled"); //[toolbar|menu|unfiled|guid]