There is a lot to love about Firefox. However, it has perhaps THE worse history searching tools of any browser. You cannot search by date, just "Last 7 Days" or whole months. Even then you cannot see on which date the search was performed: stupid and inexcusable.
Note that you can add more columns to the Library window via "Views Columns" or by right-clicking the header bar. For history this is the most recent visit date, the first visit (date added) isn't available for history.