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Re:Merry Christmas to HN by throwaway_yy2Di on Thursday December 25, 2014 @02:39AM (#8795750)
There's about a dozen extensions adding this feature -- it's an HN evergreen (because everyone loves it, and it's so easy to implement?):

https://news.ycombinator.com/item?id=8706496

(I wrote one of the Firefox ones -- CollapsableThreads.user.js)

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