Thanks Joel,
Best I can tell (others please verify for yourself), in FF 3 when you back up bookmarks via FF menu options, it backs up only the bookmarks out of the places.sqlite file to a "bookmarks***.json" file, and doesn't BU the browsing history in the places.sqlite file.
For those interested, there is a Firefox (3) extension, "SQLITE MANAGER" that views .sqlite files. There are also numerous .json file viewers.