You're right, looks like an A/B test. You can see it here: https://developer.mozilla.org/api/v1/plus/landing-page/variant/ https://developer.mozilla.org/api/v1

You're right, looks like an A/B test. You can see it here: https://developer.mozilla.org/api/v1/plus/landing-page/variant/ https://developer.mozilla.org/api/v1/plus/landing-page/varia... If you nuke the sessionid cookie and reload you'll either get "$5 a month or $50 a year" (variant 1) or "$10 a month or $100 a year" (variant 2).