Windows 10 will reach EOS (end of support) on October 14, 2025. For more information, see this article.

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my backup is lost

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i had setup a new windows and when i tried to sync my Firefox data i found nothing and all my bookmarks and passwords was lost.

i need you support to recover my data.

i had setup a new windows and when i tried to sync my Firefox data i found nothing and all my bookmarks and passwords was lost. i need you support to recover my data.

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Since you didn't backup your profile/bookmark/Firefox data once a new install happens and you log to sync it wipes clean any sync to match the new data uploaded to it. Sync "isn't" a backup device it only sync data from one device to another for Firefox sync.

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markwarner22 said

Sync "isn't" a backup device it only sync data from one device to another for Firefox sync.

It syncs to a Sync server and not device to device. This is mentioned in the Sync related articles in the KB.