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The code can be downloaded here: http://jsfiddle.net/DqUJt/
It has been tested in Google Chrome only, but I guess it will work in Firefox as well.
A couple of days ago I read two interesting discussions about Hacker News [1, 2]. I'm working now on an extension toolkit for the Hacker News homepage, but I wanted to share this first feature.
I'd love to hear your thoughts! I hope Paul does approve this, because it probably is causing a tiny bandwidth hit...
[1] A Proposal to Improve Hacker News (http://news.ycombinator.com/item?id=4399108) [2] Why I now, unfortunately, hate Hacker News.. - http://news.ycombinator.com/item?id=4396747