I've been using and recommending this for years. They've broken it twice that I can recall, but both times only briefly. It's the only thing that makes the site tolerable for me. I don't know why other people are reporting that it doesn't work for them. Usually the explanation for such differences would be that they're on the other side of a gatekeeper setting (gatekeeper being the system that FB uses for gradual rollouts) but that doesn't seem likely in this case. Maybe some sort of caching artifact, or something broken about their configs, or HNers just lying because they have an axe to grind, but it does still work at least for some of us.