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There are some extensions out that do it: https://chrome.google.com/webstore/detail/hacker-news-collapse/bbkfcamiocfccgmcjngdljolljhifdph?hl=en https://chrome.

• chdir 12y ago
  Thanks for the links. But I'm one of those who try to avoid extensions unless absolute necessary. I can't have all these extensions on my mobile devices too. It's possible to write a tiny bookmarklet that just looks for the spacers used to indent the comments. However, this is something very basic from usability point of view hence I'm making a suggestion.