Funny, following a recent HN discussion about another Chrome extension for HN, I had added something similar to my list of things to do. But my goal was to have something more like this: http://www.reddit.com/tb/b9yyc (from said-discussion: http://news.ycombinator.com/item?id=1171106)
Is there more to your extension than embedding the linked GreaseMonkey script?