Make it easier to get back to last or more recent items
Browsers already have this functionality built in. Just open things in a new tab, or duplicate the current tab you are on and then navigate back in one. You can also use your history to jump back further than just one page at a time.
I love this site but navigation can at times be a bit cumbersome (depending on what your doing) Recent items would eliminate that. Especially when comparing multiple items. A compare feature would also be super useful.