Hello, Here are some ways to fix it : -'''Restart Firefox and Computer''' -'''Check for "Clear History" Settings:''' Ensure Firefox is not set to "Delete cookies and site data when Firefox is closed." Go to Settings > Privacy & Security > Cookies and Site Data. -'''Use Troubleshoot Mode:''' Start Firefox in troubleshoot mode '''Fixing potential corrupted files : ''' -'''Remove Key Files:''' Open your Firefox profile folder (about:support) close Firefox, and delete '''logins.json''' and '''key4.db''', then restart Firefox. ''This will likely require you to re-enter saved passwords.'' -'''Restore from Old Profile:''' If you have an old Firefox data folder on your desktop, copy '''logins.json '''(passwords) and '''key4.db''' (encryption keys) into your current active profile folder. '''Check for Multiple Profiles:''' Type '''about:profiles''' in the address bar to check if a new, empty profile was created during the update instead of using your old one.