Hmm, let&#x27;s see. It does a lot of moderatory things, but general readery things include highlighting stories or commments and jumping to related pages (e.g. the story url, the thread url, the user&#x27;s profile page, the user&#x27;s comments page, other stories from that domain), opening and closing those tabs; navigating up and down comment trees (go to parent, go to prev&#x2F;next sibling); marking stories or comments as &#x27;seen&#x27; and thus hiding them, but keeping track of whether &#x27;seen&#x27; items have changed and displaying how they changed; finding comments that match regexes and highlighting the matches; if a comment contains a url, open that url in a new tab; jump around between open tabs; go to the root url of a comment (i.e. the original story item); select text and open tabs based on that text; show HN search results in the form of an HN story list that looks like the front page; take various actions based on what&#x27;s in the clipboard, or copy HN urls or titles to the clipboard; filter stories or comments being displayed according to various criteria; upvote or flag a post; go to the internet archive for a url; show the current rank of a story on pages other than the front page; request the &#x27;more&#x27; url at the bottom of a page and inline its results instead of navigating to it. Edit: I forgot one of my favorites, which is aligning the current selection to the center, top, or bottom of the window, a la ctrl+L in Emacs.<p>It&#x27;s all done by keyboard shortcuts, which means the mapping to keys is pretty complicated and not as consistent as I&#x27;d like.<p>Edit: It&#x27;s also written in a Lisp we made that only three of you have ever heard of :)