In the spirit of “worse is better”, here is a ublock filter I just threw together to highlight all the comments less than a day old:

! Jul 31, 2024 https://awful.systems
awful.systems##.comment article.comment-node :has-text("hours ago"):style(background-color:#7700AA)

EDIT: fix bug with 1 hour and 20 minutes ago. regex is even worse is better.

! Jul 31, 2024 https://awful.systems
awful.systems##.comment article.comment-node :has-text(/(hour|minute)s? ago/):style(background-color:#7700AA)

https://less.online/ - they couldn’t be bothered to write the 5 lines of js to do their karma discount automatically