Edit: should have been a reply to "just keep the tab open"... Anyways, just keep the tab open. Maybe you stumble upon it again when closing some urelated tabs.
I still have tabs open from when I researched for my paper. That was... some years ago. It must be more than 3k open at this point since it was 2k already some time ago.
Fun fact: firefox many moons ago would take a veeery long time to open. That has been fixed for quite some time now. Also, I think they stopped bombarding DNS queries for every open tab... Fun times when you opened firefox and nothing would work for some time because the DNS servers temporarily blocked you.