I thought you were trolling at first, but I realize this may actually be serious. You can lose the tab with my comment. I'm a worthless internet stranger, and if you REALLY feel the need to reply, you'll remember, anyway.
How many of those HN topics actually matter? The "may or may not read" stuff I think you can comfortably file under "does not matter" and discard for your sanity's sake.
I waste a lot of time looking at animal videos, too, but I close the tab after. I don't think that counts as something productive or necessary to revisit...
If you're closing lots of tabs, I'd hope you understand those tabs should've been closed earlier--rather than something nostalgic to revisit that never really mattered in terms of what you actually need to do?
It's fun to abuse technology, but at the end of the day, you should ask yourself... why? Is this really making your life more complete? Are you being more productive?