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bad app removes my bookmarks, how to recover?

I have many rare bookmarks. This time I sell my old laptop and rent another laptop. The laptop rental a strange windows version (probably a hack one) and some strange apps (like 360 what what), I uninstalled the 360 what what apps. Then I downloaded and installed firefox and open all bookmarks become 365whatwhat. I did not care it so much, I logged in my firefox account, but the bookmarks did not change! I click sync, all the bookmarks are still 365 or 360 whatwhat. All my previous bookmarks are lost. How to recover?

I have many rare bookmarks. This time I sell my old laptop and rent another laptop. The laptop rental a strange windows version (probably a hack one) and some strange apps (like 360 what what), I uninstalled the 360 what what apps. Then I downloaded and installed firefox and open all bookmarks become 365whatwhat. I did not care it so much, I logged in my firefox account, but the bookmarks did not change! I click sync, all the bookmarks are still 365 or 360 whatwhat. All my previous bookmarks are lost. How to recover?

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You can check what data is in the Sync cloud for your Mozilla Account using the About Sync add-on:

https://addons.mozilla.org/firefox/addon/about-sync/

After you install the add-on, you can type or paste about:sync in the address bar and press Enter to load it. The page shows each category of data currently found in the Sync cloud.

Anything useful under bookmarks?

If not, did you make any backups of the data on your old laptop?