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and since you probably won't have much luck viewing it, you can pull up a recently archived copy from Google of what they used to index the page recently (4 days ago)
Unlikely what you are looking for now, but there is an extension to change the status of visited and unvisited links for the links on page or in a selection that will affect those links on any page afterwards until visited again.
Not clear on whether you mean all of your browsing history, or for a
time period, or even for a url or something searchable, but all are covered in
* http://kb.mozillazine.org/Viewing_the_browsing_history_-_Firefox
and since you probably won't have much luck viewing it, you can pull up a recently archived copy from Google of what they used to index the page recently (4 days ago)
* http://webcache.googleusercontent.com/search?q=cache:http%3A%2F%2Fkb.mozillazine.org%2FViewing_the_browsing_history_-_Firefox
The support page destroying browsing history (what you asked for)
* https://support.mozilla.com/kb/Clearing%20Location%20bar%20history
Also see your options for what is available, the picture is clearly marked for preserving browsing history (not what you asked for)
* http://img232.imageshack.us/img232/4928/clearcachew.png
Unlikely what you are looking for now, but there is an extension to change the status of visited and unvisited links for the links on page or in a selection that will affect those links on any page afterwards until visited again.
* https://addons.mozilla.org/en-US/firefox/addon/link-visitor-3/
* notes -- http://dmcritchie.mvps.org/firefox/firefox.htm#linkvisitor
