I'm not sure if "the Navigation Pane" is the right name for the list of addresses I use frequently. E.g. if I want to go to the Microsoft help page, I would look at a list of Names (& Addresses) that I have instructed Firefox to add. In my case, i had them appear as a window on the left side of my Firefox page. The navigation pane has disappeared from my browser page. The Options selection page on my Firefox home page doesn't have a "navigation" option, or else it is hidden from my prying eyes.