If you were signed into a Firefox account before, then you should be able to sign into the same account to sync your bookmarks from Mozilla's cloud service.

For more information see How do I set up Sync on my computer?

Hi, also see - Profiles - Where Firefox stores your bookmarks, passwords and other user data, and Recover important data from an old profile.

If your question is resolved by this or another answer, please take a minute to let us know. Thank you.

alxos said

Hi i reinstall firefox cause i made a recovery on my pc and firefox wasnt starting. Idont have any firefox bookmarks backup in my pc, is there any other way to get them back???

Thank you very much