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lost all bookmarks, fvd pages and history while changing operating system even after synchronising is done in newly installed firefox

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I lost all my bookmarks, history, fvd speed dial saved pages after reinstalling firefox nd even after syncronization is done in newly installed firefox

I lost all my bookmarks, history, fvd speed dial saved pages after reinstalling firefox nd even after syncronization is done in newly installed firefox

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Merely reinstalling Firefox shouldn't have resulted in losing any Firefox data. Although, reinstalling the operating system would have deleted that data.

What about another device that you used Sync with? Is the data still there?

And if you were using Sync as a backup media, that's not what Sync was designed to do.