You can enable more columns via the right-click context menu of the header bar in the right pane (Views > Show Columns). Firefox only shows the most recent visit.

You can look at this extension:

• Norwell History Tools: https://addons.mozilla.org/firefox/addon/norwell/

Thank you, but I don't seem to find a "Views" location on my header bar when I right click. Could it be located under one of the other categories shown? I didn't find a "Show Columns" area anywhere either.

Views in one of the menus that you have on the toolbar in the Library (Show all History) and this menu has two sub menus, one being Show Columns and the other is to set the sort order that you can also set by clicking a specific column of the header bar. If you right-click the header then you can show or hide specific columns.