I included HN to the list of sites supported by the Social Cat extension.

The browser extension lets you tag/categorize/group authors and highlight their posts at the HN website. In a sense, you will immediately know if the post was submitted by someone you want to track. I hope it will be helpful to you..

Happy to add new features if you need anything:

Chrome: https://chrome.google.com/webstore/detail/social-cat/hhiomokjlngphblpfnccjckmkcpjjfmb

Firefox: https://addons.mozilla.org/tr/firefox/addon/social-cat/

Cheers