Strange about the bookmarks being gone...if it's just a upgrade for Firefox, normally your bookmarks stay with you, at least was the case with me and has been throughout upgrades so far.
Also when upgrading, keep in mind Firefox should actually tell you whilst you are online and browser open that a new upgrade is available, this includes plugins and themes too.
Changes take effect once Firefox restarted.
Re bookmarks, there is a program called Ez Firefox Backup, shareware though, i did have a copy but lost it due to a re-install.
Strange also about your passwords being gone, unless of course you don't have the option ticked in the Options menu to remember browsing history, which in turn saves your passwords, even when just upgrading.
Here's a good link to export and save your bookmarks:
http://www.ehow.com/how_1000389_expo...bookmarks.html
here's a link for getting old bookmarks back as well as saving:
http://www.zolved.com/synapse/view_c...ks_in_Firefox_
hope this helps.
