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"extensions are risky for privacy"You can also do all of this in uBlock Origin, with cosmetic filters! No additional extensions, beyond @gorhill's uBO which I assume everyone trusts highly.
ycombinator.com##a:has-text(/(\d+) minute(s?) ago/):style(color: HotPink !important; font-weight: bold)
(The selector is
very slightly imprecise. ##:xpath(//span[contains(@class,"age")]/a) would be a verbose but strictly correct way to restrict which <a/> elements are looked at (in place of just ##a). I'm not aware of a non-XPath way to express that. ##.age is a concise way to reliably select the <span/>
parent, but CSS color doesn't propagate downwards to the <a/> by the normal rules).