Hi Lillie, did you need to do more than just start Firefox, such as Refresh, reinstall, etc.? Crashes can corrupt files, but sometimes you can recover the files locally, or retrieve data using Firefox's Sync feature. It sounds like so far you haven't been able to do that for your saved logins/passwords. Is that the only missing data? (Note: this forum can't accept replies by email. Please return to your question to follow up, at https://support.mozilla.org/questions/1510518)