Hi, 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 these article.

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

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.

• https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer#w_connect-additional-devices-to-sync_

Please let us know if this solved your issue or if need further assistance.

Thank you. Well, it worked before as i have reinstalled windows and installed firefox and signed in. Don't know why its not working this time. Any help regarding this is greatly appreciated.

Hi, sorry by using it as it was it was going to fail sooner or later. There is nothing that can be done to help you with your lost info unless there is a 2nd Profile in this location with a older date :

• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

If you did a complete format then it would be gone.