This Chrome extension does pretty much what you want: https://chrome.google.com/webstore/detail/hacker-news-mark-all-read/ogfbcfkihdkplelnaenpgkhnkpoaggjc https

This Chrome extension does pretty much what you want: https://chrome.google.com/webstore/detail/hacker-news-mark-all-read/ogfbcfkihdkplelnaenpgkhnkpoaggjc https://chrome.google.com/webstore/detail/hacker-news-mark-a...