Hi

Thank you for your question about the Firefox Sync service.

It appears from your question, that you are using Firefox Sync as a back up service. This is not what Sync is designed to do. The Firefox Sync service takes a copy of the data you wish to include and transfers it to a second device (typically a mobile device such as a tablet or a telephone) running a copy of Firefox. The storage in between all attached devices is both temporary and fragile and is not stable enough to be (and is not designed as) a reliable backup service.

If you have a copy of your Firefox profile for desktop Firefox, you may be able to recover your bookmarks and other data. Please have a read of this article.

If you have a copy of your data on a mobile version of Firefox, please follow these instructions to connect it to Firefox Sync to copy your data.

Did you previously create a CSV backup of the logins (username and password)?

• https://support.mozilla.org/en-US/kb/export-login-data-firefox
• https://support.mozilla.org/en-US/kb/import-login-data-file

You may need to enable Import from CSV in the Password Manager (about:logins) in about:config if this menu item currently is hidden.

• about:config => signon.management.page.fileImport.enabled => true
• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

You can refresh the about:logins page or close and restart Firefox to make the "Import from a File" menu item appear in the three-dot menu on about:logins.

For future use, see:

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile
• https://support.mozilla.org/en-US/kb/restore-bookmarks-from-backup-or-move-them