Are you are reinstalling your computer or has it crashed and you can’t retrieve your old bookmarks. Then you can save your bookmarks (favorites) for once and for all? The Firefox add-on “Xmarks” is your tool to do this.
You can even make different bookmark-lists for different workspaces (home, office, etc). This tool even syncs your newly added bookmarks.
You can find this add-on on http://www.xmarks.com/ or on https://addons.mozilla.org/en-US/firefox/addon/2410