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