Have a look at this article, then read the rest of my post before doing anything.

• Can't add, change or save bookmarks - How to fix_i-can-add-or-change-bookmarks-but-they-are-lost-when-i-restart-firefox
• _{Also glance at Recover lost or missing Bookmarks}

Please use the method or renaming the file places.sqlite, rather than deleting it. Also note it is worth first of all installing and running the addon places maintenance that may not fix your issue but is unlikely to cause any harm, and it may just possibly help.

• https://addons.mozilla.org/firefox/addon/places-maintenance/

Deleting or renaming places.sqlite will cause you to lose your History, but that may be the only option you have.

Note that you should at least remove the places.sqlite-shm and places.sqlite-wal SQLite temp files if you only rename places.sqlite to force Firefox to create a new file.

You can check for problems with the places.sqlite database (bookmarks, history) in the Firefox profile folder.

See also:

• 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

Thank you John99 and cor-el. The bookmarks have started working fine now.