Oal, podés intentar lo siguiente: verificá que no tengas activada la opción de borrar el historial al cerrar Firefox, ya que esto puede eliminar las contraseñas guardadas. Si el problema persiste, reinstalar la app puede ayudar. En todo caso, si sigue sin funcionar, podés usar un administrador de contraseñas externo como Proton Pass o Bitwarden, ambos seguros, privados y con extensiones compatibles con Firefox

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You can check that Firefox isn't set to clear your history on exit, since this can delete saved passwords. If the problem continues, reinstalling Firefox might help. As an alternative, if it still doesn’t work, you could use an external password manager like Proton Pass or Bitwarden (open-source), which are secure, private, and have extensions that work with Firefox. It’s much safer to use an external password manager than the one built into browsers