Hi, first try restarting Firefox - 3-bar menu > Exit Firefox in bottom right corner.

If that doesn't help, please see -

• Profiles - Where Firefox stores your bookmarks, passwords and other user data.

• Recover important data from an old profile.

If your question is resolved by this or another answer, please take a minute to let us know. Thank you.

chick.merkel said

Firefox did an update to 'seamlessly work with Win 10'. When Firefox restarted, ALL MY BOOKMARKS WERE GONE. I went to the library and tried to restore bookmarks. It won't do it! I have a entire computer backup system, but have NO CLUE where to find my bookmarks. So frustrated. I've used Firefox for a ton of years and never had my bookmarks disappear.

Well...after googling some more, I discovered that there was a 40.0.02 update. I did that & now my bookmarks are back.

Note that such issues can be caused by a problem with a corrupted places.sqlite file.

If it happens again then you can check for problems with the places.sqlite database file in the Firefox profile 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

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