delete Firefox history

Forums: 

BB doesn't seem to remove all of the Firefox history. I visited www.napaonline.com , closed Firefox , ran BB. When I started Firefox again, I searched for Napa auto parts in the Firefox Google search box. The results returned by Google for www.napaonline.com were highlighted , showing that I visited that site already. Running BB should have removed the history, right? I don't get it. Why does this happen? I'm using BB 0.9.3, Firefox 14.0.1 and Linux Mint 11.
thanks,
reddogg