This is a bit more noticeable-as-being-a-bug in bug 1912406, I think -- over there, there's a carousel that periodically scrolls on its own, using smooth-scroll actions. In Firefox, these periodic scroll events are a bit harder to visually track, since we go from being perfectly-still to scrolling-at-top-speed without any user interaction. So if the user is e.g. trying to read something on the previously-visible-part-of-the-carousel, that piece of content will suddenly disappear out from under them without warning. Arguably the Chrome behavior of slow-start-with-gradual-acceleration works better for this sort of use-case.
Bug 1916760 Comment 6 Edit History
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This is a bit more noticeable-as-being-a-bug in bug 1912406, I think -- over there, Amazon Prime Video has a carousel that periodically scrolls on its own, using smooth-scroll actions. In Firefox, these periodic scroll events are a bit harder to visually track, since we go from being perfectly-still to scrolling-at-top-speed without any user interaction. So if the user is e.g. trying to read something on the previously-visible-part-of-the-carousel, that piece of content will suddenly disappear out from under them without warning. Arguably the Chrome behavior of slow-start-with-gradual-acceleration works better for this sort of use-case.