HI Immy87, There are two ways, well three, that you can look at this.

If you click on the icon next to the star again of a page you already bookmarked you can select "Show all bookmarks" and sort the column by last visited column.

The second way is to click on the menu Bookmarks > Show All Bookmarks

The third is opening the Bookmark Panel by Ctrl + B at the same time(however this does not show date, but the most recent will be in the "Unsorted Bookmarks" folder)

And that would be for desktop. My apologies for this mistake. For Android, if you open a new tab the recent history and recent tabs will be there, but not bookmarks. There is a feature however called the Reader Mode that you can create a list of webpages to read later: View articles in Reader View on Firefox for Android

If you tap the address bar, Firefox displays a series of panels. Usually you'll swipe left (past History and Top Sites) to get to the bookmarks list. I think they appear in the order you added them.