Jim
Read this:
http://tln.lib.mi.us/~amutch/pro/mozilla/kgo.htm
and
http://tln.lib.mi.us/~amutch/pro/mozilla/klocation.htm
about how the history works.
You can either set the settings to never save URLs or you can just delete them from prefs.js if you want. Hopefully, in the next version, this process can be automated.
Andrew