Sorry - it was just that HN recognized the link as being submitted before, but it had an awful and completely irrelevant title, so no one would know what it was unless they went hunting for this amazing script at random; unless they knew it existed in the first place and went looking for it.
In other words, it completely defeated the purpose of sharing the link, because they would have only known about it if it was there. A true catch-22.
All I wanted to do was let HN readers know how to enhance their user experience here on the site in the best way possible.
Perhaps, however, the real question should be "Why doesn't HN have features like this integrated from the start up?" How come some scripting hackers can integrate something like a basic search function into the site, while HN can't seem to do so itself?