Let's start with; https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save '''Note:''' Some software, like Advanced SystemCare with Surfing Protection, can protect files in the Firefox profile folder against changes. If you have such software then check the settings or uninstall this software. ----------------- Places Maintenance [v57+] See; https://support.mozilla.org/en-US/kb/use-troubleshooting-information-page-fix-firefox#w_places-database http://kb.mozillazine.org/Locked_or_damaged_places.sqlite https://support.mozilla.org/en-US/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file