For anyone to help more what method did you try? So they don't answer the same question of what to try.

Sorry to hear about this problem. You mentioned using Restore -- do you mean the built-in feature to restore a bookmark backup described in this article: [[Restore bookmarks from backup or move them to another computer]]? What went wrong there? For example, older dates are not listed on the menu, or Firefox displayed an error message, or it just seems that nothing happened. '''''If the Restore menu doesn't list older dates:''''' Do you recall Firefox mentioning either of these during your update: (A) Performing a Tune-Up or Refresh (B) Needing to create a new profile In both cases, your data probably is available in a different folder and we can describe how to find and use it. And last but not least, if you haven't already, check out this article: [[Recover lost or missing Bookmarks]].