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Why not link to a more useful page?

Because I already submitted it, just over 100 days ago: http://news.ycombinator.com/item?id=310045

Glad people finally saw it - the submitter was smart to point out it's a FF extension in the title.

I see. Is it not possible to submit the same URL twice? (serious question, I've never tried).

It's not. HN will automatically link you to the previous submission.