I vibe coded the shit out of a Chrome extension that does that while waiting on CI/CD. Go read the content.js to make sure I'm not hacking your shit, download the repo to your computer, enable developer mode in chrome, "load unpacked", point it at the directory with those files, and enjoy your tool tips.
https://github.com/fragmede/honest-hn-tooltips
Edit: Took 18 minutes.
Two days ago I created HN new comments highlighter with hiding of old comments - took me 2 prompts and ~ 10 mins + some clean up. https://github.com/gala8y/hn-comments-highlighting-and-hidin...