I have a browser extension that allows you to comment and vote as if it's HN.

https://chromewebstore.google.com/detail/hckernews-helper/gm...

https://addons.mozilla.org/en-US/firefox/addon/hcker-news/ https://hcker.news/notes/browser-extension

(Safari ext coming soon)

The extension itself follows the principle of least privilege. It doesn't even have access to the HN site cookie.