If you don't have access to the old computer any longer, '''no'''. Unless you were using something like the Google Toolbar & Google Bookmarks or Xmarks, which would have your bookmarks in an online account that you could access. Firefox doesn't include an online storage feature for personal data, yet. That is coming in a future version. If you have a friend at your old job maybe they have access to that old PC and they could export your bookmarks to a file and email that file to you.