I usually have 2 sessions opened and sometimes I accidentally close one. I can't get it back. I am suggesting an option to view and restore tabs opened 20 seconds or something like that before the closing of the session. Maybe there can be a tab under the history tab to view the previously opened tabs and a button to restore them. Maybe a button for each to restore each tab individually. I have had this problem a few times now and there are others on forums talking about it. I'm not a programmer, but possibly you can take the already implemented ability to view recently closed tabs next to the minimize button and extend the ability to post session closing along with buttons to bulk and individually restore the tabs.
Thanks for your time and consideration