Binabik: Have a look at Mozillazine Knowledge Base: Lost bookmarks , it may give you some help also on how to find them. According to this if it is caused by the installer not properly detecting all Firefox processes, they are not lost.
(ocultar) ¿Quieres jugar más partidas pero no terminas de decidir que tipo de juego empezar? Entra en un torneo con partidas aleatorias. (pauloaguia) (mostrar todos los consejos)