nitaukhurgunashvili, two things to try. ---- It might be worth checking the integrity of your places.sqlite file, which is where Firefox stores bookmarks. To do this: # go to Help menu (press alt+H) # select "More Troubleshooting Information" # on the page that opens, scroll down to "Places Database" and press the "Verify Integrity" button # once the check has finished, Look for any lines in the report that startt with a "-" or that contain the term "error" If any errors are reported, try restarting Firefox and re-running the integrity check to see if Firefox was able to fix them after the first check. You may want to repeat this process again if errors are still found during the second integrity check. ---- You might be able to restore user data that has gone missing after a Firefox update by following the steps in this article: https://support.mozilla.org/en-US/kb/recover-user-data-missing-after-firefox-update