If you only see the time then the date is today, once the date is in the past, you should see the date as well. Note that for the history there is only the most recent visit column that shows data, the other columns are for the bookmarks.

The problem comes when I visit a websites, say, 3 times. There is one time I visit it (the second one), that is when I want to know when I did it. But Firefox won't give me that information. Rather, it will order the "added" or "recently" dates, but not give me the date, although I guess the "added" date should be somewhere in the system. But I'm not sure if the date of the second one is somewhere in the system.

Note that for the history there is only the most recent visit column that shows data, the other columns are for the bookmarks.

I'm not sure if the "added" is part of the bookmarks only; it also orders the time when history events were added.

Firefox keeps a history item for each time you visit a specific URL and use this to calculate the visits count, but is doesn't store the actual first visit (i.e. if you clear old history data then the visit count is adjusted for the remaining visits of a URL).

For me I get a Sort by Name if I click the Added column header, what could be expected since this column doesn't have data.

When/If you click on "Added" column, it gets sorted by the time it was added. But this time is an enigma. And still if it weren't, i don't know if other dates (such as a not first / not last time, or just dates, I just want the raw dates) are stored (I guess yes).

On Windows, I can use this program to pull a full visit list from the places.sqlite database: http://www.nirsoft.net/utils/mozilla_history_view.html

I don't know whether there is a similar native program for Linux, or a Firefox add-on that also can do it.