Firefox: Javascript challenge
Chromium: No javascript challenge
Edge: No javascript challenge
How could you call this anything but an attack against firefox?
edit: Seems cloudflare has responded[1] and they claim it is a setting set up by the site author. So this attack is done by g2, using cloudflare, then.
edit: with FF OFC.
(There's a reason Hanlon's razor was given that name, I'm pretty sure, and that's because it's not too dissimilar from – essentially it's a much-more-situation-specific subset or variant of – Occam's razor. But I don't think "attribute to stupidity" was what the parent comment was suggesting.)