Refer: https://support.mozilla.org/en-US/questions/1126509
You can look at this extension:
- Password Exporter: https://addons.mozilla.org/firefox/addon/password-exporter/
You can copy files like these to the current Firefox profile folder to restore specific data.
- bookmarks and history: places.sqlite
- bookmark backups: JSON backups in the bookmarkbackups folder
- SQLite files like cookies.sqlite (cookies) and formhistory.sqlite (saved form data)
- logins.json and key3.db (decryption key) for Passwords saved in the Password Manager
- cert8.db and possibly cert_override.txt for (intermediate) certificates stored in the Certificate Manager
- persdict.dat for words you added to the spelling checker dictionary
- permissions.sqlite for Permissions and possibly content-prefs.sqlite for other Site Preferences
- sessionstore.js for open tabs and pinned tabs and tab groups
You can use this button to go to the current Firefox profile folder:
- Help > Troubleshooting Information > Profile Directory:
Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder - http://kb.mozillazine.org/Profile_folder_-_Firefox
See also:
- https://support.mozilla.org/kb/restore-bookmarks-from-backup-or-move-them
- https://support.mozilla.org/kb/Recovering+important+data+from+an+old+profile