Is there any way to clean up the contents of the "Most Visited" smart bookmark in Firefox 3?

I have a few sites in my “Most Visited” smart bookmark that are redundant. For instance, Gmail is showing up four times, as “https://mail.google.com/mail/#inbox”, https://mail.google.com/mail/?shva=1#inbox”, https://mail.google.com/mail/”, and “https://mail.google.com/”. Is there a way to eliminate this clutter other than by always bookmarking the very last page in the set of redirects? (Even that would only get rid of two of these entries, still leaving me with two rather than one.)