Epic Privacy Browser Forums

I know it's late to answer this but hope this helpful for others,You can check for problems with the places.sqlite database (bookmarks and history) in the Firefox profile folder.

addons.mozilla.org/firefox/addon/places-maintenance/
See also:

kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
support.mozilla.org/en-US/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file