honestbleeps/Reddit-Enhancement-Suite — pull request #104 by wal-f (2012-04-12 14:16:12+00:00)
Title: See a comment's context without navigating away

I hate it when you read a good comment, but its parent comment(s) are way above and out of view. This toggles sibling comments' visibility so you can see the context without ever leaving the page, nor loading anything more from reddit's servers.