Do you see the entries with the right arrows? Your bookmarks should be in there. You will need to move things around in the manager to have them show up with just the icon.

You can check for problems with the <b>places.sqlite</b> database file (bookmarks, history) in the Firefox profile folder. *Places Maintenance: https://addons.mozilla.org/firefox/addon/places-maintenance/ If the Places Maintenance extension can't repair the places.sqlite database file then remove all places.sqlite file(s) in the Firefox profile folder to make Firefox rebuild the places.sqlite database file from the most recent JSON backup in the bookmarkbackups folder. *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