On rare occasions one or more of my bookmarks or folders (usually important ones) spontaneously disappear and I would like to know why.

Just today another one, my very valuable and frequently used business folder, was not there in my bookmarks when I turned on the computer. I had to reconstruct the whole folder as best as I could remember. As far as I could tell nothing else was removed. I would like to know if this has ever happened before to other Firefox users? I have a working antivirus program on my computer and have had no problems along those lines. So..........what is causing this? I use Firefox exclusively, no other browsers.

If that are bookmarks that were created the previous day then that can happen if Firefox sees a problem with the places.sqlite database file on the next start and rebuilds the database from a JSON backup in the bookmarkbackups that didn't have them yet.
A possible cause is a problem with the file places.sqlite that stores the bookmarks and the history.
*http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
*https://support.mozilla.org/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file
You can also try to repair the places database with this extension:
*https://addons.mozilla.org/firefox/addon/places-maintenance/

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