[informalo]

For userstyles, you can do that with uBlock's custom filters [1] [2]

  news.ycombinator.com##a:has-text(Hacker News):style(color: green !important)

[1]: https://github.com/gorhill/uBlock/wiki/Procedural-cosmetic-f... [2]: https://github.com/gorhill/uBlock/wiki/Static-filter-syntax#...

[notpushkin]

The only problem with that is that uBO applies it via JS polling (I think?) and this results in the unstyled content flashing very briefly. Pretty annoying sometimes; hope it also gets into a standard (or jyst gets a native implementation for the sake of adblocking).