How to migrate from Firefox 2 to Firefox 3
Carsten Knobloch, who is responsible for quite a few German localized portable applications and my portable edition of Flock, wrote an article about the steps to take when moving on the Firefox 3. His suggestion: secure what needs to be secured and start with a fresh installation and a new profile.
The articles deals with:
1. Exporting all your passwords,
2. Exporting your bookmarks and
3. Importing these in Firefox 3 again.
The article is in German, but well illustrated so even if German isn’t your language you should be able to follow the instructions.