Here are the extensions for those who don't want to load Slideshare (it's kind of heavy on slow connections):

https://chrome.google.com/webstore/detail/tldr/ohmamcbkcmfal...

https://chrome.google.com/webstore/detail/hackerface/daljeje...

https://chrome.google.com/webstore/detail/hacker-news-hotkey...

https://chrome.google.com/webstore/detail/hacker-news-collap...

https://chrome.google.com/webstore/detail/hacker-news-show-p...