The System Details list shows you run an older Firefox 28 version that is no longer supported with security updates. *Mozilla/5.0 (Windows NT 6.3; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0 Please update to the current Firefox 56.0.2 release. *Help -> About Firefox *https://support.mozilla.org/en-US/kb/update-firefox-latest-version If you updated then you need to update until you are at the current release because there are intermediate versions required to update your profile properly. ---- You can check for problems with the <b>places.sqlite</b> database (bookmarks and history) in the Firefox profile folder. *https://addons.mozilla.org/firefox/addon/places-maintenance/ See also: *http://kb.mozillazine.org/Locked_or_damaged_places.sqlite *https://support.mozilla.org/en-US/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file