Why do ios upgrades on my MacBook Air delete my firefox, open tabs, bookmarks and information
And when it does, how can I restore my open tabs and bookmarks from my synced information?
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In a case like this, do not sync until you have restored the missing data. If you sync first, it could lose the stored data.
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