I always see this behavior with young SDEs. But using chrome. And they are militant about not restarting their browser when they are clearly having browser issues. I always ask why don't you bookmark these things? Or how can you possibly see which tab is which? While they take a whole minute to bring back up thentab they had open.
As someone who doesn't even use bookmarks and instead just relies on the awesome bars history...why do you keep 100's of tabs open and not bookmarked?
This person can solve their "problem" by just saving the open session to a new folder in the bookmark toolbar. And never have this happen again. They can even call it memory lane.