Hacker News: Is It Really Just a Marketer's Lottery?

Regarding your "Theory 3: It’s Not An Entirely Efficient Design"

I usually go through a few pages of Hacker News and open anything that looks interesting in a set of tabs.

If the article I've enjoyed reading happens to be of from a page of Hacker News that I no longer have open, I probably won't look for it within HN just so that I can upvote it.

It'd be nice if there was a Chrome Extention or something that would let me upvote the HN article.