Look on your desktop. Do you see a folder called; '''Old Firefox?''' https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

'''Refresh''' is supposed to carry forward your bookmarks into a refreshed Profile; bookmarks shouldn't get deleted. As FredMcD mentioned the '''Refresh''' procedure will create a folder on your desktop that is labeled '''Old Firefox Data''' which would contain a backup of your bookmarks and browsing history in the places.sqlite file. If you don't have that '''Old Firefox Data''' folder I would suspect that you stopped the Refresh procedure before it ran its full course, which can seem to take a long time depending on how old the Profile is and how much data it contains. The first time I did the Refresh ''(to see what that feature was all about)'' it was with a fairly fresh Profile that I didn't use for much other than testing new features in Firefox ''(only a few months old and not used very often)''; well, that procedure ran for '''close to 5 minutes''', with no "progress meter" to indicate how far the procedure was had gone and how much time remained. I got tired of waiting for it to end, thinking the process was hung-up and I force closed Firefox; that was the end of my data - POOF that data was gone due to my impatience. ''But my bookmark backups remained in the Profile folder so I was able to restore that last backup and didn't lose my bookmarks.'' Data is held in RAM and when Firefox is closed the RAM that Firefox is/was using is cleared, as is how Windows works with all applications. That said, you should have bookmark backups available. https://support.mozilla.org/en-US/kb/restore-bookmarks-from-backup-or-move-them#w_restoring-from-backups