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I upgraded to v89. I exited Firefox. I installed v78.11.0esr (32-bit). I lost my bookmarks and history.

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I lost my bookmarks and history bold text

'''I lost my bookmarks and history''' '''bold text'''

Alle svar (3)

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Look on your desktop. Do you see a folder called; Old Firefox? Look inside. Look for the folder with the latest creation date.

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


https://support.mozilla.org/en-US/kb/recover-user-data-missing-after-firefox-update

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https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder

https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles


Type about:profiles<enter> in the address bar. How many profiles are listed? How many should be there? Also, open the profile folder in your file explorer.


https://support.mozilla.org/en-US/kb/recover-user-data-missing-after-firefox-update

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If you are running Firefox 78 ESR and Firefox 89 side-by-side, you could use Sync to share your data across. Otherwise, I doubt the Firefox 89 file formats are backwards compatible all the way to Firefox 78.

See: How do I choose what information to sync on Firefox?