So this is the second time in a month that cyber criminals have targeted NitrogenSports for this so called Firefox addons. And it's good that you have caught it before someone created an account and spread this scam in this community. I also did check NitrogenSports and it seems they are all aware of this potential malicious attempts using their name as there are warning banners when you login to their platform already.
Probably this scammers are trying to find their niche target here, Lol, offering exorbitant rewards but I'm sure gamblers are more intelligent than lets say average crypto investors who simply fall for tricks like fakeaways or bitcoin doubler.
And because gamblers see this, they can go and verify to sports platform immediately and causing this trick to be busted and exposed much earlier.