A chrome extension that tracks which comments have been read on HackerNews. We define read as comment has been in viewport for 7 seconds.
Comments that have been read will have striped background and will have an orange bar on the right, as shown in screenshot below:
This also installs mark all as read and mark all as not read links, as shown in the screenshot below:
The extension works by saving ARTICLE_ID-COMMENT-ID entries in localStorage.
Instal this extension by using Load unpacked via chrome://extensions/ page.