In history, Firefox only shows the most recent visit to any given URL. To find earlier visits, you need a tool that lets you view the older data in the places.sqlite database. These threads have discussion of some options: * [https://support.mozilla.org/questions/1017990 How can I locate a log of dated activity on a mozilla firefox where I know I should have entries in my history yet they do no show - and without being deleted?] * [https://support.mozilla.org/questions/937585 Support for "Date first visited" for history items was removed from Firefox. What was going on behind the scenes to cause this to happen?] - read further down for more detail on the WHERE clause options * [https://support.mozilla.org/questions/981055 Recalling a page from History erases the old history date. Any way to retain that older history entry along with the current one?] - additional examples

As recommended, I used the SQLite Manager extension, ran the suggested queries and one of them worked. Thank you.