Well.. the lovely thing that I've experience about Firefox bookmarks is that that are xml (html) based. Meaning they can be easily exported and imported. Yay..
What does that mean for you and I.. well for the end user we can import our contacts easily..
Try to keep up.
(kidding)
Bookmarks > Manage.... > Top left hand corner (File) left click export to send your bookmarks off.
As for cookies.. you should be able to view these cookies in the their respective folders and just move them from installation to installation.
Is that what you ment Sir Cooks?