You can create a new "smart" search folder to show recently added bookmarks. In this thread, I described the steps to manually create a search folder with the 20 most recent. I haven't checked to make sure it still works, but do you want to give it a try? [https://support.mozilla.org/en-US/questions/934205 is there a way to auto store more than 10 sites in the recently bookmarked folder]