i'm not sure you really understand what the extension does
It does the exact same thing as the bookmarklet, as far as I can tell.
The bookmarklet only allows you to submit pages.
This extension displays the top 15 HN stories, gives links to them, and also gives a link to each of their comment pages.
Yeah, I'm using it. I was replying specifically to the comments in this thread about the "Submit Current Link" feature making it easier to post links. Sorry for being unclear.