Steps to reproduce:
Followed link to https://mozilla.crowdicity.com/post/721353
I am unfamiliar with crowdicicity, clicked welcome to try to find an explanation, see if this is an official Mozilla site, etc. https://mozilla.crowdicity.com/
Both pages use a "sticky" header, which animates sliding about if users try to Page Down. And probably also if they try to scroll.
Both pages have various animated zooming pain-elements.
The Welcome page also has an animated pain-carousel.
Outreach pages which exclude certain disabled people and disability groups from feedback may miss accessibility feedback.
So if this is an official Mozilla page, then 1. don't link to it without appropriate safety warnings, and 2. either redesign or replace it for wider accessibility.