Firefox 3 will not import FF2's bookmarks.html

[Pete Holsberg]

I installed FF3 from a tarball and tried to import bookmarks from the 
bookmarks.html file in the FF2 profile.

I can select that file but when I click Open, the windows closes without 
adding the bookmarks.

There is a places.sqlite file, but the Ctrl-B sidebar is empty.

What have I not done?

Thanks.