Every time I read the comments here at HN, I always find myself wishing I could collapse the comments the way you can on Reddit, so I wrote a little script to add that functionality to the site.

Chrome Extension: https://chrome.google.com/webstore/detail/gcomokcpehnfjcegfilpfenjnjfkefpc

Greasemonkey Script: http://userscripts.org/scripts/show/105251

I'm working on making a native Firefox extension, but it's a little more complicated than I expected.

The source is available here: https://github.com/andrewheins/HN-Comment-Hider